2

I'd like to hide this menu from ever appearing in firefox's address bar. I have no use for it and it adds visual noise. How can this be done?

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3

tl;dr

Add this to your userChrome.css:

#pageActionButton {
    display: none !important;
}

(there is no direct alternative in about:config).

Detailed

  1. Go to about:support in the address bar.
  2. Click the Open Directory button in the Profile Directory line.
  3. In this directory, create a directory called chrome.
  4. In the chrome directory, create a file called userChrome.css (note the capital C in userChrome).
  5. In this file, add these exact lines:
#pageActionButton {
    display: none !important;
}
  1. Restart your browser

Bonus

To remove the redundant vertical separator (|) that remained where the ellipsis used to be, add this to userChrome.css:

#pageActionSeparator {
  display: none !important;
}

Generally, to edit stuff in that area, you can use this (from Firefox support).

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