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Welcome.

For now, the tweaks will live here on this wiki and will be divided topically.

Firefox profiles live in different places based on your operating system (see also the official documentation).

• Linux: ~/.mozilla/firefox/{RANDOM}.{PROFILENAME}/
• Mac OS: ~/Library/Application Support/Mozilla/Firefox/Profiles/{RANDOM}.{PROFILENAME}/
• Windows: C:\Users\{USERNAME}\AppData\Roaming\Mozilla\Firefox\Profiles\{RANDOM}.{PROFILENAME}\

Within your profile directory, create a chrome subdirectory and in it, a userChrome.css file.

The top of this file (perhaps after some CSS comments), declare the XUL namespace:

/* Firefox UI tweaks */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

Here are a few tweaks that I can't live without:

• Hide bookmark names on the bookmark toolbar (only when the name starts with a space)
• Hide bookmark icons on the bookmark toolbar (only when the name ends with a space)
• Multi-row tabs