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How to show profile name in titlebar

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I start multiple firefox instances with --profile-manager or with -P /path/to/profile/dir and I would like to distinguish those in gnome by seeing different titlebars.

Is it possible to achieve this in firefox 57 by any extension or by modification of about:config?

I start multiple firefox instances with --profile-manager or with -P /path/to/profile/dir and I would like to distinguish those in gnome by seeing different titlebars. Is it possible to achieve this in firefox 57 by any extension or by modification of about:config?

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You can install the Nightly Tester Tools add-on (even in release versions) and use the string (${Profile}) in its options/preferences to show the active profile name in the title bar. However, that variable currently does not work due to limitations of the WebExtensions API, which may be resolved in the near future. As soon as that’s possible, other add-ons (that could do this until the WebExtensions change or some time ago) may be able to do this too.