I changed to Murrine and to gmail older version simultaneously - now I believe that what helped wasnt' Murrine, but changing GMail.
Officially Google doesn't support Firefox 3 yet; there are plenty of angry messages about it in gmail discussion groups.
I tried the Murrine workaround and it did not seem to help. I think
this is a pretty major bug. Browsing certain pages with Firefox is very
slow and there appears to be no way for me to workaround.
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Slow performance with Gmail
https://bugs.launchpad.net/bugs/217580
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