The default resolution in Firefox is 96 dpi; the real resolution, which the X server knows from the monitor, is ignored. The problem is also discussed upstream, see https://bugzilla.mozilla.org/show_bug.cgi?id=83060 The obvious symptom is that the fonts are too small. But on Fedora, more comlicated problems can appear, when the resolution used by pango does not match the resolution used by firefox; see, for example, bug #240959.
We are speaking about variable browser.display.screen_resolution.
I have added a long explanation to the upstream bug, see https://bugzilla.mozilla.org/show_bug.cgi?id=83060#c21
According to https://bugzilla.mozilla.org/show_bug.cgi?id=83060#c22 the bug is fixed upstream. So it is important to mention that I observed the bug with firefox-1.5.0.10-6.fc6.
browser.display.screen_resolution was replaced by layout.css.dpi upstream 15 months ago https://bugzilla.mozilla.org/show_bug.cgi?id=327406 for Firefox 2 (Gecko 1.8.1) and newer, but not Firefox 1.5.x. Support for the 1.5 branch of Firefox is within hours of being terminated. Please upgrade to Firefox 2 if you find FF 1.5.x behavior unacceptable.
(In reply to comment #4) > Support for the 1.5 branch of Firefox is within hours of being terminated. > Please upgrade to Firefox 2 if you find FF 1.5.x behavior unacceptable. Bad answer, sorry to say that. a) it's hard to upgrade to Firefox 2 when he is on FC6 and he doesn't want outside-of-official-repo packages, b) don't spread inacurrate statements -- FF 1.5.* will be supported in Red Hat for a long time (it is in RHEL5, at least) and FC6 will be supported for many months to come.
Yes, he just was copying what upstream said. We should see how difficult it is to backport this to 1.5. This might be WONTFIX, though depending on it. Upgrading to FC7 after it's release is probably the best solution.
Fedora Core 6 is no longer supported, could you please reproduce this with the updated version of the currently supported distribution (Fedora 7, 8, or Rawhide)? If this issue turns out to still be reproducible, please let us know in this bug report. If after a month's time we have not heard back from you, we will have to close this bug as CANTFIX. Setting status to NEEDINFO, and awaiting information from the reporter. [This is mass-filed message to all open Fedora Core 6 bugs related to Xorg or Gecko. If you see any other reason, why this bug shouldn't be closed, please, comment on it here.]
Since there are insufficient details provided in this report for us to investigate the issue further, and we have not received feedback to the information we have requested above, we will assume the problem was not reproducible, or has been fixed in one of the updates we have released for the reporter's distribution. Users who have experienced this problem are encouraged to upgrade to the latest update of their distribution, and if this issue turns out to still be reproducible in the latest update, please reopen this bug with additional information. Closing as INSUFFICIENT_DATA.