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I'm running several Firefox instances side by side on Ubuntu, each with a different user profile.

When each of them has several open windows I get a stack of sometimes two dozen windows, which is very difficult to choose from the specific instance I'd like to e.g. open a new tab in.

Is there an elegant way to differentiate between them? E.g. some about:config trick to add a prefix or suffix to the window title of all windows from a specific profile ? (i.e not a universal change for all instances in a resource shared by all profiles).

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  • Have you figured out how to manipulate this directly, without the extension? The toolkit is not compatible with the current version of firefox.
    – Dale
    Jul 10, 2014 at 19:35

3 Answers 3

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The Firefox extension MR Tech Toolkit can, among many other options, replace the "Mozilla Firefox" text that is appended to the title bar to anything you like, which can also include the profile name.

Below is shown how to change it to the name of the profile ("default" in my case).

image

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  • thanks! do you have any idea where it makes this modification? I'd like to manipulate it directly, without an extension.
    – GJ.
    Sep 12, 2010 at 20:04
  • Nope, but it's easy enough to find out: use the extension once to change title bar, see which Firefox file has been modified, save file, change again and compare to find where the change is done.
    – harrymc
    Sep 12, 2010 at 20:28
  • So sad that this toolkit hasn't been updated to work with the current version of Firefox :(
    – Dale
    Jul 10, 2014 at 19:32
  • @Dale: You might try to install it from the home page, using the Download button.
    – harrymc
    Jul 10, 2014 at 19:48
  • even in the home page the extension is disappeared. Have to -1 this, sorry
    – Ooker
    May 1, 2016 at 10:28
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There is a Firefox add-on called Show Profile by neo82 that worked for my purposes. Below is the screenshot of its Preferences panel.

image description

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This answer won't help you since I see you're running Linux, but the question itself is generic so I figured I'd offer an answer for any Windows Firefox users in a similar conundrum.

SysInternals Process Explorer is a useful tool that will show all running processes, and also has the handy ability to identify what process a window is associated with by clicking on it with a target cursor.

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  • the link doesn't work
    – Ooker
    May 1, 2016 at 10:29

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