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How to enable Firefox WebExtensions on Mozilla websites (in https://www.ghacks.net/2017/10/27/how-to-enable-firefox-webextensions-on-mozilla-websites/): - Load about:config in the Firefox web browser. - You can run a search for just to make sure it does not exist: privacy.resistFingerprinting.block_mozAddonManager. It does not in the most recent Firefox Nightly builds at the time of writing. - Right-click in the part of the window that lists the preferences, and select New > Boolean from the context menu. - Name the new Boolean value: privacy.resistFingerprinting.block_mozAddonManager. - Set its value to true.

The only way to modify UI is adding custom CSS code to userChrome.css and userContent.css files inside browsers profile folder. Keep in mind CSS code can not create entirely new items, buttons or toolbars. It only can modify already present ui items. 1. Find your profile folder ('profile names are different for everyone'). All OS: about:support > Profile Folder > Open Folder 2. User styles belong into "chrome" subolder. Create it, if there is none yet. PROFILENAME chrome 3. Copy userChrome.css, userContent.css and subfolders into chrome subfolder. How to use custom user styles? The userChrome.css and userContent.css files works like an optionsconfigurations file. All main "features" can be enabled and disabled there.