Users of the Pale Moon browser recently discovered, upon upgrading to Pale Moon 25, that 2 popular add-ons for blocking ads (Adblock Plus & Adblock Edge) no longer worked properly. The main complaint was the disappearance of the toolbar icon.
This issue was the result of a decision of the Pale Moon developers to stop identifying the browser as Firefox variant, and for Pale Moon to have its own unique application GUID.
In most cases this caused no issues with regards to add-on compatibility, since Pale Moon does accept add-ons with a Firefox GUID, as well as those with a Pale Moon GUID.
But with regards to Adblock Plus and Adblock Edge, there will be a need going forward for both add-ons to officially support Pale Moon, or they will not work.
You can read more about it here:
Unless and/or until both add-ons begin officially supporting Pale Moon, you will either have to find other means for blocking ads, or use this edited Adblock Plus add-on, from the Pale Moon site. Please be sure to remove Adblock Plus/Adblock Edge from your browser before installing this version:
After installing this version you will notice the return of your toolbar icon and that the add-on functions as it should.