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When I receive a notification, a window pops up and stays for around 4 sec.

How can I change the timeout to something else ?

I have Firefox ESR 52

Also, can I change the background color of the notifications ? Perhaps in UserChrome.css ?

1
  • It would be better to include one or more screenshots of a typical notifications.
    – harrymc
    Jul 18 '19 at 7:27
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How can I change the timeout to something else ?

This value is hard-coded. See Mozilla DXR. To adjust it, grab the Firefox Sources make your changes and recompile.

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