a lot more addons were ruined by the last Firefox update. I have removed it and moved to "ESR" (Firefox Extended Support Release ESR):
https://www.mozilla.org/en-US/firefox/52.3.0/releasenotes/

This way one can keep all the extensions and still have a browser accepted/made by Mozilla.

The developer(s) behind Waterfox intend to keep support for "legacy" extensions in its releases of the Firefox-based browser.  Of course, that is just one part of the equation.  If the extension developers keep giving up on their projects, then browser support is moot.

The developer(s) behind Waterfox intend to keep support for "legacy" extensions

-thank you for reminding me. I was using it for many months, but got tired of being told by various robots that Waterfox was obsolete. It seems Mozilla has changed their policy on that subject.

The otherwise very fine EPUBReader version 2 does not install on Firefox ESR.
EPUBReader version 1.5.0.12 is needed for ESR: https://addons.mozilla.org/en-US/firefox/addon/epubreader/versions/?page=1#version-1.5.0.12

EPUBReader version 2.05 https://addons.mozilla.org/en-US/firefox/addon/epubreader/ works on Waterfox (version 55) 

(...) pave the way to keeping add-on support in Waterfox. Waterfox now uses its own separate profile directory and migrates all your existing data to it. In the coming weeks the website will get an infrastructure update to pave the way for an add-on store.

Waterfox will also be coming to Android, (...)

"LEGACY" used to be a good word, a word you would be pleased to see. Now it's a word to be scared by, a word to put you down:

Forgive me, smart phone users in particular, this is a looong picture; 662 x 3687 pixels (162kb):

click to enlarge for LEGACY (highlighted in yellow):

[attachthumb=#]

---------------
modified for more usable photo sizes, 4x 702 pixels plus 1x 879 pixels (it turns out I've miscalculated, but now I don't bother to change it):

"LEGACY" used to be a good word, a word you would be pleased to see.

Not in the world of software, Curt :-)

I'm really just giving feedback, but appreciate all your suggestions. FF used to be a good browser, but somehow it just doesn't seem so great anymore. Pale Moon does not work with XP or I would switch.

I wonder why you would update your browser(s) to the latest versions, but refuse to update the OS to at least a decently updated version

Mozilla will remove "legacy" extensions from AMO starting in October 2018. I am in the process of searching a new home for OpenDownload²...

FWIW there is a 57 and above version too, how usable and as featured it is I don't know

For my own needs i was looking for an easy way to add Dark Theme to Websites.
My own tries kinda work, but only for pages where i inject Css Code.

Now i discovered a really neat plugin "Dark Reader"

Here is Mainlink
Supports native Chrome, Firefox and Safari Browsers and is also avail as OpenSource via GitHub.
Since i am using Opera, i can tell with "Chrome support" addon installed, it works just great for me.

A preview of my current view:

@dantheman: I suspect that you might be asking the wrong question here.
For example:

• I used to use FEBE (at the time when it was the only available extension backup tool, I think), but its development started to lag a little, and then Firefox brought in the Sync functionality, which made FEBE somewhat redundant. So I used Sync instead of FEBE, and - just in case - kept contingency copies of the installers of my fav extensions. So I was mostly covered, from a backup perspective.
  
• When I eventually switched to Slimjet - after becoming sick and tired of Mozilla and their control-freak trips, wrecking all that was good about Firefox (for me) - I was happy using the Sync functionality that was built into Slimjet/Chrome. That was until recently, when Google appeared to be starting with the same control-freak tricks that Mozilla had been up to - in this case, silently switching off one of my fav extensions (so I had to keep switching it on again when I ran Slimjet) and then completely zapping it  - this was the excellent BadAdJohnny extension.
  
• However, after the Firefox experience, I was prepared for this, and I am in the habit of saving backup copies of the installers of extension that look as though they might be at risk of unilateral prohibition/deletion by GodMode Google. Of course, that will only work if Google don't go down the same path as Mozilla and enforce obsolescence of all/any extensions that they don't approve of on an ongoing basis. I consider backup copies of the extension installers to be a "lowest common denominator" approach - i.e., rather than a backup tool like FEBE (and its restore component).
  
• So, from a user perspective, I have taken a relatively independent path that is based on a complete lack of trust of the browser providers/supporters. This has generally worked well, though I thought I had been caught out when Mozilla made the Scrapbook extension obsolete, but I've overcome that hurdle with newer technology - i.e., saving webpages as .mhtml files), which are indexable/searchable via WDS (Windows Desktop Search) and GDS (Google Desktop Search), etc..

So, whether you are using Quantum, or something else, the question might better be: How can my processes be made more resilient and more certain of avoiding falling into the trap of relying on transient proprietary backup solutions from unreliable/fickle providers?
This is one of the concerns that I have regarding my tendency for increasing reliance on MS Office OneNote. I mean, if the supplier can kick off what looks to be a definite new line of integrated computing - such as Windows Phone (Windows 10) and complete with a new Sony-Ericsson smartphone designed for it - and then simply drop it all "just like that", where the heck does that leave the users who have been suckered into using it? If they'd said at the outset (like Google tend to do) that these are trials or Betas, then that could at least be a little more honest, but no, they didn't elect to do that and we have all read the message, loud and clear: "Screw the users/customers".

"Share Extension" has been good to me (as well as any other Chrome extension) so far:
https://chrome.google.com/webstore/detail/share-extensions/chdafcbnfkfenoeejpaeenpdamhmalhe

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Extensions for Google Chrome™

Generated: Sun, 25 Nov 2018 23:46:17 GMT
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Extensions: 19
- Video Downloader Til Facebook: https://chrome.google.com/webstore/detail/aobeeghhhohhefmlmbpmkcdndgebpfkf
- Share Extensions: https://chrome.google.com/webstore/detail/chdafcbnfkfenoeejpaeenpdamhmalhe
- Super Video Downloader: https://chrome.google.com/webstore/detail/ckpnpjlanobhkgplmpkefcchgjmdaonh
- Open With: https://chrome.google.com/webstore/detail/cogjlncmljjnjpbgppagklanlcbchlno
- Search by Image (by Google): https://chrome.google.com/webstore/detail/dajedkncpodkggklbegccjpmnglmnflm
- uBlock: https://chrome.google.com/webstore/detail/epcnnfbjfcgphgdmggkamkmgojdagdnn
- Bulk Image Downloader: https://chrome.google.com/webstore/detail/facoldpeadablbngjnohbmgaehknhcaj
- Save The Session: https://chrome.google.com/webstore/detail/gfokkgedgncpmhnbomipnbnpkedjpbil
- Selection Search: https://chrome.google.com/webstore/detail/gipnlpdeieaidmmeaichnddnmjmcakoe
- Britannica Insights: https://chrome.google.com/webstore/detail/hfipegnjbpgdlgifpfdcfnjnhepckmbf
- Power Thesaurus: https://chrome.google.com/webstore/detail/hhnjkanigjoiglnlopahbbjdbfhkndjk
- Wikipedia: https://chrome.google.com/webstore/detail/imilikhegdfjlcbgakjieeecgdnomiel
- Open in Firefox: https://chrome.google.com/webstore/detail/lmeddoobegbaiopohmpmmobpnpjifpii
- Thesaurus: Synonym 4 Right Click: https://chrome.google.com/webstore/detail/lpkpcliecpgjbkffooidajhakoidhidh
- Instant Save for Instagram and Flickr: https://chrome.google.com/webstore/detail/majobfiinhihjjndfdncncgdfgdncnek
- Google Dictionary (by Google): https://chrome.google.com/webstore/detail/mgijmajocgfcbeboacabfgobmjgjcoja
- Open in MS Edge™: https://chrome.google.com/webstore/detail/mjoebkkejejidnkfdekpbooceogbapnf
- Print Friendly & PDF: https://chrome.google.com/webstore/detail/ohlencieiipommannpdfcmfdpjjmeolj
- f*ck overlays: https://chrome.google.com/webstore/detail/ppedokobpbdajgiejhnjfbdjlgobcpkp

Disabled Extensions: 0

Apps: 4
- Google Drev: https://chrome.google.com/webstore/detail/apdfllckaahabafndbhieahigkjlhalf
- YouTube: https://chrome.google.com/webstore/detail/blpcfgokakmgnkcojhhkbfbldkacnbeo
- Online-Convert.com: https://chrome.google.com/webstore/detail/dlfhgjcpnkofndjpgimpgmkgmgfkmlan
- Gmail: https://chrome.google.com/webstore/detail/pjkljhegncpnkpknbcohdijeoejaedia

Exported with Share Extensions for Google Chrome™ - https://chrome.google.com/webstore/detail/chdafcbnfkfenoeejpaeenpdamhmalhe

Applikation: Firefox ESR 52.9.0

Applikation: Firefox 52.9.0 (20180621064021)
Operativsystem: WINNT (x86_64-msvc)

• about:addons Launcher 1.1.1-signed.1-signed
  
  • http://www.AccessFirefox.org
  • Firefox 8.0 - 12.0a1
  • Toolbar button to launch the Add-ons Manager. Button opens the Add-ons Manager in a new tab and can be placed on any toolbar including the Add-on Bar
• Absolute Enable Right Click & Copy 1.3.4
  
  • https://addons.mozilla.org/da/firefox/addon/absolute-enable-right-click/?src=api
  • toolkit@mozilla.org 42.0 - *
  • Force Enable Right Click & Copy
• Adblock Plus 3.4.1
  
  • https://adblockplus.org/
  • Adblock Plus anvendes på over 500 millioner enheder og er således verdens mest populære ad blocker.
• Add to Search Bar 2.9
  
  • http://firefox.maltekraus.de/extensions/add-to-search-bar
  • Firefox 34.0 - 46.0a1
  • Tilføj hvilken som helst søgning, på hvilken som helst side, til søgefeltet.
• Add-ons Manager Context Menu 0.4.2.1-signed.1-signed
  
  • http://loucypher.github.com/AM_contextmenu/
  • Firefox 9.0 - 56.*
  • SeaMonkey 2.1 - 2.23.*
  • Thunderbird 9.0 - 26.*
  • toolkit@mozilla.org 9.0 - 56.*
  • Add more items to Add-ons Manager context menu.
• All Downloader Professional 1.98.2
  
  • https://addons.mozilla.org/da/firefox/addon/all-downloader-professional/?src=api
  • toolkit@mozilla.org 48.0 - *
  • All Downloader Professional finds links, images, videos, documents on a website an make them downloadable.
• Application Update Service Helper 2.0
  
  • Firefox 52.9.0 - 52.*
  • Sets value(s) in the update url based on custom checks.
• Audio Downloader Prime 0.1.9
  
  • http://mybrowseraddon.com/audio-prime.html
  • Easily download most popular audio formats.
• Bulk Image Downloader 5.13.0.1
  
  • http://bulkimagedownloader.com
  • toolkit@mozilla.org 50.0 - *
  • Integrates Bulk Image Downloader (a Windows only app that must be installed separately) with FireFox
• Classic Theme Restorer 1.7.3.4
  
  • https://github.com/Aris-t2/ClassicThemeRestorer
  • Firefox 45.0 - 56.*
  • 'Classic Theme Restorer' genskaber Firefox-menuknappen, firkantede faneblade, tilføjelseslinjen, små knapper på navigationslinjen, og andre ældre knapper og mere. Brug 'Tilpas' for at flytte knapperne hen på værktøjslinjerne.
• Clean Uninstall 0.2.0
  
  • http://firefox.add0n.com/clean-uninstall.html
  • Firefox 38.0a1 - *
  • {8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4} 27.1.0b1 - 27.*
  • Uninstall an extension and clean its fingerprints (stored preference values for instance)
• CoLT 2.6.7
  
  • http://www.borngeek.com/firefox/colt/
  • Firefox 38.0 - 56.*
  • Tilføjer et Kopier linktekst-punkt til browserens kontekstmenu.
• Context Search 3.69
  
  • https://github.com/odebroqueville/contextSearch/
  • toolkit@mozilla.org 42.0 - *
  • Searches the selected text using a search engine from a pre-specified list.
• Context Search 0.6.4
  
  • http://www.basson.at/firefox-addons/contextsearch
  • Firefox 45.0 - 47.*
  • Expands the context menu's 'Search for' item into a list of search engines.
• Copy Plain Text 2 1.6
  
  • https://addons.mozilla.org/da/firefox/addon/copy-plain-text-2/?src=api
  • Firefox 4.0 - 56.*
  • SeaMonkey 2.0 - 2.45
  • Thunderbird 3.0 - 48.0
  • Kopierer uden tekstformatering.
• Don't Fuck With Paste 2.3.1
  
  • https://github.com/aaronraimist/DontFuckWithPaste
  • toolkit@mozilla.org 48.0 - *
  • Prevents the blocking of copying from & pasting into input fields
• Download Manager (S3) 4.13
  
  • http://www.s3blog.org/
  • Firefox 26.0 - 56.*
  • {8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4} 24.0 - 27.*
  • Vis og håndter filhentninger fra en smart nydelig statusbjælke
• Enable Right Click and Copy 2017.4.12
  
  • toolkit@mozilla.org 52.0 - *
  • Enable selecting, copying, pasting and right clicking on pages that restrict them.
• EPUBReader library 1.6.0.1
  
  • http://www.epubread.com/
  • Firefox 18.0 - 54.*
  • SeaMonkey 2.15 - 2.32.*
  • Export ebooks from EPUBReaders private library
• Extension List Dumper 2 1.0.2
  
  • https://addons.mozilla.org/da/firefox/addon/extension-list-dumper-2/?src=api
  • Firefox 17.0 - 56.*
  • SeaMonkey 2.26 - 2.46
  • Thunderbird 31.0 - 45.*
  • {8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4} 27.0 - 27.*
  • Dumps a list of the installed extensions.
• Facebook Video Downloader 1.1
  
  • This extension adds a button to download every Facebook Video.
• Flagfox 5.2.3
  
  • https://flagfox.wordpress.com/
  • Firefox 24.0 - 56.*
  • SeaMonkey 2.21 - 2.53.*
  • Viser et flag, der afbilleder den pågældende servers placering
• Flash Video Downloader 16.2.8
  
  • http://www.fvdmedia.com/
  • Popular Video Downloader.
• Flickr Size Pickr 1.2.0
  
  • https://addons.mozilla.org/da/firefox/addon/flickr-size-pickr/?src=api
  • toolkit@mozilla.org 48.0 - *
  • Adds a context menu to view or download any Flickr photo
• Google Reverse Image Search 64.1.0
  
  • http://barisderin.com
  • toolkit@mozilla.org 42.0 - *
  • Google Reverse Image Search is a simple tool that lets you search the images reversely on Google Images.
• Google search link fix 1.6.7
  
  • https://github.com/palant/searchlinkfix
  • toolkit@mozilla.org 42.0 - *
  • Prevents Google and Yandex search pages from modifying search result links when you click them.
• Google Yandex Reverse 0.0.4
  
  • http://dmtr.org/
  • Firefox 38.0a1 - *
  • {aa3c5121-dab2-40e2-81ca-7ea25febc110} 38.0a1 - *
  • Reverse Image Search / Search with images / Google and Yandex
    Right click any image to perform search using new tabs.
• I don't care about cookies 2.9.3
  
  • https://www.i-dont-care-about-cookies.eu/
  • Get rid of annoying cookie warnings from almost all 'infected' websites!
• Image Context Menu 0.0.2
  
  • https://addons.mozilla.org/da/firefox/addon/image-context-menu/?src=api
  • Firefox 38.0a1 - 56.*
  • {aa3c5121-dab2-40e2-81ca-7ea25febc110} 38.0a1 - 43.0
  • Adds right-click context menu items for image related tasks.
• Image Toolbar 0.6.18
  
  • http://www.basson.at/firefox-addons/imagetoolbar
  • Firefox 27.0 - 48.*
  • Provides easy access to common image functions.
• image-save 1.2
  
  • https://addons.mozilla.org/da/firefox/addon/instagram-save/?src=api
  • toolkit@mozilla.org 48.0 - *
  • Allows to save images from Instagram with right click 'Save Image as...' .
• InstaDown: Instagram Image & Video Downloader 1.0.3
  
  • https://addons.mozilla.org/da/firefox/addon/instadown-instagram-image-vide/?src=api
  • Firefox 38.0a1 - *
  • {aa3c5121-dab2-40e2-81ca-7ea25febc110} 38.0a1 - 43.0
  • The extension adds a direct download button for images found on instagram user pages, and also for videos on single item popups.
• Interclue 1.6.3.1-signed.1-signed
  
  • http://interclue.com/
  • Firefox 3.0 - 4.0.*
  • {a463f10c-3994-11da-9945-000d60ca027b} 0.4 - 1.9
  • The ultimate link augmentation multitool
• Link Text and Location Copier 1.8.1
  
  • https://evilnickname.github.io/link-text-location-copier
  • toolkit@mozilla.org 42.0 - *
  • Copy links in various formats to the clipboard from the context menu. Heavily inspired by the CoLT add-on.
• Multi-process staged rollout 1.10
  
  • Firefox 52.9.0 - 52.*
  • Staged rollout of Firefox multi-process feature.
• Multiple File Downloader 1.5.0
  
  • https://github.com/mediascience/Browser-Multiple-Downloader/wiki
  • toolkit@mozilla.org 48.0 - *
  • Quickly get the downloads and nothing else.
• Nightly Tester Tools 3.10
  
  • https://wiki.mozilla.org/Auto-tools/Automation_Development/Projects/Addons/NightlyTesterTools
  • Firefox 39.0 - 56.0
  • SeaMonkey 2.38 - 2.53
  • Thunderbird 39.0 - 56.0
  • toolkit@mozilla.org 39.0 - 56.*
  • Useful tools for the nightly tester.
• Open in Wayback Machine 2.0.2
  
  • https://github.com/hijarian/wayback-for-firefox
  • Firefox 38.0a1 - 56.*
  • A button and context menu item to open URL in the Wayback Machine, service to view previous versions of websites from archive.org.
• Open RegEdit Key 1-0-0
  
  • https://addons.mozilla.org/firefox/addon/open-regedit-key/
  • Firefox 4.0 - 56.*
  • SeaMonkey 2.2 - 2.46
  • [WINDOWS ONLY] Open selected registry key directly in the registry editor from context menu.
• Open With 6.8.6
  
  • https://github.com/darktrojan/openwith
  • Firefox 45.0 - 56.*
  • SeaMonkey 2.40 - 2.46.*
  • Thunderbird 38.0 - 54.0a1
  • {8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4} 27.0 - *
  • Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click.
• Paste Quote 0.3.6.1-signed.1-signed
  
  • http://www.cusser.net
  • Firefox 3.0 - 56.*
  • Lets you paste text as forum quotations from the context menu.
• pinterest-without-login 1.0
  
  • browse Pinterest without login/registration, removing the offending modal popup
• Pocket 1.0.5
  
  • Firefox 52.9.0 - 52.*
  • When you find something you want to view later, put it in Pocket.
• Print Friendly & PDF 1.3
  
  • http://www.printfriendly.com
  • toolkit@mozilla.org 42.0a1 - *
  • Print Friendly and PDF any Webpage
• Restart Browser 1.1
  
  • https://www.time-restart.ga/
  • toolkit@mozilla.org 42.0 - *
  • Allows to restart the browser with a button.
• RightToClick 2.9.6
  
  • https://addons.mozilla.org/en-US/firefox/addon/righttoclick/
  • Firefox 34.0 - 42.*
  • Allows right clicks, highlighting and more where forbidden by javascript
• S3.Translator 6.15
  
  • http://www.s3blog.org/s3translator.html
  • toolkit@mozilla.org 52.0 - *
  • Translation of selected text, introduced by a phrase or a fully web-site from any language to any language
• Saved Password Editor 2.10.4
  
  • https://addons.mozilla.org/addon/saved-password-editor/
  • Firefox 52.0 - 56.*
  • SeaMonkey 2.39 - 2.49
  • Thunderbird 45.0 - 52.*
  • Adds the ability to create and edit entries in the password manager.
• Self-Destructing Cookies 0.4.12
  
  • https://addons.mozilla.org/da/firefox/addon/self-destructing-cookies/?src=api
  • Firefox 38.0a1 - 56.*
  • {aa3c5121-dab2-40e2-81ca-7ea25febc110} 38.0a1 - *
  • Fix the web. Gets rid of a site's cookies and LocalStorage as soon as you close its tabs. Protects against trackers and zombie-cookies. Trustworthy services can be whitelisted.
• Session Manager 0.8.1.13
  
  • http://sessionmanager.mozdev.org/
  • Firefox 38.0 - 56.*
  • SeaMonkey 2.33 - 2.50
  • Gemmer og henter tilstanden for alle vinduer.
• Show my Password 2.0.1-signed.1-signed
  
  • http://netcat.ath.cx/extensions.html
  • Firefox 1.5 - 56.*
  • SeaMonkey 2.0a1 - 2.0.*
  • Shows your password in readable letters
• Simple YouTube MP3 Button 1.2.1
  
  • https://www.convertmp3.io
  • toolkit@mozilla.org 48.0 - *
  • Adds a small and simple button to YouTube videos that allows you to quickly download the audio of the video as an MP3 file (quality of the MP3 is as high as the video offers).
• SoundCloud MP3 Downloader 0.2.0
  
  • http://add0n.com/soundcloud-tools.html
  • toolkit@mozilla.org 48.0 - *
  • Add download link to all SoundClould tracks
• Status-4-Evar 2017.08.20.15
  
  • http://forums.mozillazine.org/viewtopic.php?f=48&t=2001965
  • Firefox 45.0 - 56.*
  • Status-widgets og forløbsindikatorer til Firefox 4+
• Stylish - Custom themes for any website 3.1.8
  
  • https://userstyles.org
  • toolkit@mozilla.org 42.0 - *
  • Customize any website to your color scheme in 1 click, thousands of user styles with beautiful themes, skins & free backgrounds.
• Tab manager 0.20
  
  • https://addons.mozilla.org/da/firefox/addon/tab_manager/?src=api
  • toolkit@mozilla.org 42.0 - *
  • Allows basic operations on open tabs, such as copying the URLs to the clipboard, and saving the tab list to a file.
• Tab Session Manager 3.1.2
  
  • https://addons.mozilla.org/da/firefox/addon/tab-session-manager/?src=api
  • toolkit@mozilla.org 42.0 - *
  • Save and restore the state of windows and tabs. It also supports automatic saving.
• Textarea Cache 0.9.3.4
  
  • https://addons.mozilla.org/en-US/firefox/addon/textarea-cache/
  • Firefox 14.0 - 56.*
  • Allows to save automatically the content in a text input field.
• Textarea Cache 3.20.0
  
  • https://addons.mozilla.org/en-US/firefox/addon/textarea-cache/
  • toolkit@mozilla.org 51.0 - *
  • Allows to save automatically the content in a text input field.
• To Google Translate 3.3
  
  • https://github.com/itsecurityco/to-google-translate
  • Highlight text on a web page and send it to Google Translate or listen the pronunciation.
• Toolbar Buttons 1.1.1-signed.1-signed
  
  • https://codefisher.org/toolbar_button/
  • Firefox 20.0 - 56.*
  • postbox@postbox-inc.com 1.0.0 - 3.0.*
  • SeaMonkey 2.20 - 2.38
  • Thunderbird 20.0 - 41.0
  • {8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4} 20.0 - 25.*
  • Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey.  Some of the buttons make commonly preformed actions quicker, others add new functionality.
• uBlock Origin 1.17.2
  
  • https://addons.mozilla.org/da/firefox/addon/ublock-origin/?src=api
  • Endelig en effektiv blocker. Lavt CPU- og hukommelsesforbrug.
• Video DownloadHelper 6.3.3
  
  • http://www.downloadhelper.net/
  • Firefox 36.0 - 49.0
  • Download Videos from the Web
• Wayback Machine 1.8.6
  
  • https://archive.org/
  • toolkit@mozilla.org 48.0 - *
  • Reduce annoying 404 pages by automatically checking for an archived copy in the Wayback Machine.
• Web Compat 1.0
  
  • Firefox 52.9.0 - 52.*
  • Urgent post-release fixes for web compatibility.
• YouTube Unblocker Plus 2.0.4
  
  • http://www.ytunblocker.com/
  • Gesperrte YouTube-Videos ansehen.

@dantheman:
"Share Extension" looks kinda handy, but apparently only useful IF the extension is available from the official Google Store or whatever. (is that correct?) Not sure I see the point in it.

@Curt - Extension List Dumper is incompatible with Quantum - boy, Mozilla sure knows how to create a mess! 
Are they competing with Microsoft with their Hotmail, Live and Outlook?

At one point i was wondering why Firefox was over 1.5G is resource usage as opposed to Vivaldi or Edge which were hanging around .400-500
Turns out, after removing half a dozen extensions, one by one, it was Adguard the culprit.
So now, i've been using uBlock Origin on all browsers and it is doing fine.
Sure, don't want to point the finger at Adguard since it could be a compatibility issue with other extensions right?
Then again, thought Mozilla would have had all these issues resolved since the day they kicked out all the good old legacy extensions...