Just to disambiguate: when you say "Firefox Official APT package", are you referring to the official Ubuntu package (which is a 'snap' these days)? (Mozilla also has its own "official" .deb and apt-repo, details on https://support.mozilla.org/en-US/kb/install-firefox-linux#w_install-firefox-deb-package-for-debian-based-distributions , but that requires some non-default system configuration so I suspect that's not what you're talking about). Also, can you check Firefox's DevTools to see what font is actually being selected, in the "good" vs. "bad" cases? See bug 1850830 comment 2 for steps on how do do that (labeled (1) through (4) there). Note that Ubuntu doesn't actually ship with the Arial font, so unless you've manually installed it yourself, we have to find some similar font (and Firefox defers to the system `fontconfig` configuration to choose which font to use). And I have a guess at why you might be getting different results... If you're seeing a difference between the Ubuntu-provided Firefox vs. another version like Portable Firefox, then I would guess that Ubuntu's `snap` packaging is the explanation, since that does add some application-isolation restrictions, which might be impacting font discoverability. You could test that by trying to run the Firefox binary extracted from the official Mozilla-provided .tar.bz2 archive, from e.g. https://www.mozilla.org/en-US/firefox/new/ . I'm guessing that version might not show the issue.
Bug 1892620 Comment 2 Edit History
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Just to disambiguate: when you say "Firefox Official APT package", are you referring to the official Ubuntu-provided default-installed Firefox package (which is a packaged via 'snap' these days)? (Mozilla also has its own "official" .deb and apt-repo, details on https://support.mozilla.org/en-US/kb/install-firefox-linux#w_install-firefox-deb-package-for-debian-based-distributions , but that requires some non-default system configuration so I suspect that's not what you're talking about). Also, can you check Firefox's DevTools to see what font is actually being selected, in the "good" vs. "bad" cases? See bug 1850830 comment 2 for steps on how do do that (labeled (1) through (4) there). Note that Ubuntu doesn't actually ship with the Arial font, so unless you've manually installed it yourself, we have to find some similar font (and Firefox defers to the system `fontconfig` configuration to choose which font to use). And I have a guess at why you might be getting different results... If you're seeing a difference between the Ubuntu-provided Firefox vs. another version like Portable Firefox, then I would guess that Ubuntu's `snap` packaging is the explanation, since that does add some application-isolation restrictions, which might be impacting font discoverability. You could test that by trying to run the Firefox binary extracted from the official Mozilla-provided .tar.bz2 archive, from e.g. https://www.mozilla.org/en-US/firefox/new/ . I'm guessing that version might not show the issue.
Just to disambiguate: when you say "Firefox Official APT package", are you referring to the official Ubuntu-provided default-installed Firefox package (which is a packaged via 'snap' these days)? (I'm asking because Mozilla also has its own separate "official" .deb and apt-repo, details on https://support.mozilla.org/en-US/kb/install-firefox-linux#w_install-firefox-deb-package-for-debian-based-distributions , but that requires some non-default system configuration so I suspect that's not what you're talking about). Also, can you check Firefox's DevTools to see what font is actually being selected, in the "good" vs. "bad" cases? See bug 1850830 comment 2 for steps on how do do that (labeled (1) through (4) there). Note that Ubuntu doesn't actually ship with the Arial font, so unless you've manually installed it yourself, we have to find some similar font (and Firefox defers to the system `fontconfig` configuration to choose which font to use). And I have a guess at why you might be getting different results... If you're seeing a difference between the Ubuntu-provided Firefox vs. another version like Portable Firefox, then I would guess that Ubuntu's `snap` packaging is the explanation, since that does add some application-isolation restrictions, which might be impacting font discoverability. You could test that by trying to run the Firefox binary extracted from the official Mozilla-provided .tar.bz2 archive, from e.g. https://www.mozilla.org/en-US/firefox/new/ . I'm guessing that version might not show the issue.