What are your most important Web Browser features?

[KynloStephen66515]

Curious as to what the most important features in a Web Browser for people here is.

Mine are:

• WebGL Rendering
• WebSocket Support
• Bookmarks (Although I don't use it often)
• Tabbed Browsing
• AdBlocking Plugins
• Downloads Section
• Open Recent Tabs

Will add more if I remember more

[app103]

• Security
• Reliability/stability
• Multi-line scrollable bookmarks toolbar
• Repositionable multi-colored, multi-row tabs
• A customizable searchbar
• Session saving
• A functional statusbar
• ad and script blocking
• Userscript and custom CSS capabilities
• Custom user defined buttons
• A souped up sidebar
• Dev tools (firebug)
• fast bookmark searching
• Easy, immediate access to everything (don't force hiding things behind complicated menu systems) Hamburger buttons suck!
• a real titlebar
• UI colors that respect the user's desktop theme
• Single window mode

[kunkel321]

Different "instance" in each tab, so if one crashes, they don't all crash.

[Giampy]

First of all security, and first of all the possibility to disable/enable Javascript (by a dedicated key or by disabling Javascript for all the websites excluding the trusted ones).

As an alternative, or as an additional layer of security, I deeply appreciate a sandbox.

Then Ghostery, AdBlock, the possibility to improve the readability of certain websites, HTML5 to see videos.

[fenixproductions]

Number one is: standards support without any prefixes supported by default (no -moz-, -webkit-, -o- or -ms-).

No BS in this matter like google does with MathML.
If you don't want to support some parts of standard don't claim you support it fully.

Other features? Look at old Opera