Is it possible to add a toolbar separator to Firefox (126.96.36.199)? I can't see the option;
Used to be available.
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To the left of the window you show in your question should be "Additional Tools and Features" which contains the available toolbar buttons. You can drag and drop these buttons onto an open toolbar.
You can install the Classic Theme Restorer add-on to get additional toolbar buttons as well as other useful features.
If you don't have any open toolbars to use a a drop target, then click on "Show/Hide Toolbar" at the bottom of the "Additional Tools and Features" screen.
See Customize Firefox controls, buttons and toolbars for more information.
I am not affiliated with Classic Theme Restorer in any way, I am just an end user of the software.
You can add separators to Firefox's toolbars without any add-on, even with the new Photon UI. I've tested this in Firefox Nightly (currently 57.0a1). The graphical option to do so, however, was removed long, long ago.
about:configinto the address bar.
customizableui-special-separator2(separated by commas) wherever you want a separator.
In the case below I've added a separator between the new container tab and uBlock Origin buttons, so those particular values in that preference look like this:
You could try on Classic Theme Restorer which would give you: Squared tabs, AppMenu, Add-on bar, small button view, and many more 'old' features for Firefox 29+. Which could help to make Firefox better