This is likely caused by https://bugzilla.mozilla.org/show_bug.cgi?id=296818 .
To quote: "The thing is, the x11 pixmap is the _only_ place we're storing
our image data.". Apparently, there are many circumstances where Firefox does
not request for that to be freed. (Ie. when crashing, but also potentially in
other circumstances as well.)
I can definitely confirm this having existed since Firefox 0.3, on
multiple distributions, multiple X versions (Xfree86/Xorg, along the
years), multiple arches, and also on FreeBSD. I have restarted my X in
average once per day because of this bug during these years.
** Changed in: firefox (Ubuntu)
Sourcepackagename: None => firefox
Status: New => Confirmed
** Also affects: epiphany (Ubuntu)
Importance: Undecided
Status: New
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/usr/bin/X leaks memory with firefox
https://bugs.launchpad.net/bugs/111299
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