Topic: the defaults for Firefox, General, Language & Appearance, Fonts

Enforce Browser Fonts – Get this Extension for 🦊 Firefox (en-US)

Disable or Remove “Extensions” Button from Firefox Toolbar [UPDATED] – AskVG

Firefox Extension Development [3] Browser Button

Mozilla is working on a single Extensions button for its Firefox web browser - gHacks Tech News

Mozilla Firefox is getting an extension button similar to Chrome

How to add an Extension button to the Firefox toolbar

Your second extension - Mozilla

Hunter for Firefox: Email Finder extension

Get the Best Mozilla Firefox VPN Extension

DeepL on X: Firefox devotees—the day you've been waiting for is here! Our browser extension is officially available for Firefox. 🦊 / X