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About this Add-on
You can use any CSS supported by your version of Firefox.
Add other menus/actions if you right or middle click on the App Button.
By default you get control over how it appears normally, when you hover the cursor over it and when it is open.
Requires a little knowledge of CSS if you wish to do more than what the presets offer.
Advanced users can also change the selectors via about:config, know that changes may affect all of browser.xul
+ More hidden options in about:config, under extensions.customappbutton..
--> Setting for private browsing (works fine)
--> Setting for left click action (does not prevent normal action)