+++ This bug was initially created as a clone of Bug #562977 +++ You should not have closed that bug, and was not allowed to reopen it :-( What I wrote 9 years ago (!) in https://bugzilla.mozilla.org/show_bug.cgi?id=562977#c39 still holds (at least with version 102). When trying to connect to a mail server where the connection hangs for some reason, CPU load increased by about 60% (of one core of my current Linux machine, but I had the bug also with MacOS). The statement by :Paenglab at https://bugzilla.mozilla.org/show_bug.cgi?id=562977#c83 that this cannot be reproduced is wrong. Anyone interested can reproduce the issue in a straightforward way: put any garbage IP address (e.g., 1.2.3.4) as the SMTP, IMAP, or POP server name and try sending (or receiving, respectively) emails. There are numerous related issues/bugs, also with Firefox, since 10+ years. It's a shame that this is still not fixed.
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+++ This bug was initially created as a clone of Bug #562977 +++ You should not have closed that bug, and was not allowed to reopen it :-( What I wrote 9 years ago (!) in bug 562977 comment 39 still holds (at least with version 102). When trying to connect to a mail server where the connection hangs for some reason, CPU load increased by about 60% (of one core of my current Linux machine, but I had the bug also with MacOS). The statement by :Paenglab at bug 562977 comment 83 that this cannot be reproduced is wrong. Anyone interested can reproduce the issue in a straightforward way: put any garbage IP address (e.g., 1.2.3.4) as the SMTP, IMAP, or POP server name and try sending (or receiving, respectively) emails. There are numerous related issues/bugs, also with Firefox, since 10+ years. It's a shame that this is still not fixed.