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how to change the window/titlebar icon of a firefox profile in linux without extensions?

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ignis_vulpecola
ignis_vulpecola
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Firefox-esr 45.9 on Debian Stretch.

I would like to associate a custom window/titlebar icon (the icon you see at the top-left corner of an application window, not the icon of an application launcher, see screenshot) to different firefox profiles without using extensions. I found only outdated guides and none of them work.

So far, following the aforementioned guides, I created one or more of the following icons: 

   - main-window.ico
   - main-window.xpm
   - defaul16.png
   - defaul32.png
   - defaul48.png

located at one of the following paths: 

   ~/.mozilla/firefox/CUSTOM_PROFILE/chrome/icons/default/
   ~/.mozilla/firefox/CUSTOM_PROFILE/browser/chrome/icons/default/

As a reference, the default firefox setup on my system provides: 

   $ ls  /usr/share/firefox-esr/browser/icons/
   mozicon128.png
   $ ls /usr/share/firefox-esr/browser/chrome/icons/default/
   default16.png  default32.png  default48.png
Firefox-esr 45.9 on Debian Stretch. I would like to associate a custom window/titlebar icon (the icon you see at the top-left corner of an application window, not the icon of an application launcher, see screenshot) to different firefox profiles without using extensions. I found only outdated guides and none of them work. So far, following the aforementioned guides, I created one or more of the following icons: - main-window.ico - main-window.xpm - defaul16.png - defaul32.png - defaul48.png located at one of the following paths: ~/.mozilla/firefox/CUSTOM_PROFILE/chrome/icons/default/ ~/.mozilla/firefox/CUSTOM_PROFILE/browser/chrome/icons/default/ As a reference, the default firefox setup on my system provides: $ ls /usr/share/firefox-esr/browser/icons/ mozicon128.png $ ls /usr/share/firefox-esr/browser/chrome/icons/default/ default16.png default32.png default48.png
Attached screenshots

Modified by ignis_vulpecola