> I found something interesting: this does not affect password fields.
That is interesting.
I wonder if it could be related to spell checking. I'm going to try
turning off the spell checker and see if it changes anything and will
report the outcome in a few days.
http://support.mozilla.com/en
> Since we both have the DownloadHelper extension I tried disabling it and
> rebooting, but Firefox still gets very slow after a while.
Thanks for trying that. I suspected DownloaderHelper because
downloading many Youtube clips seemed to accelerate the slowdown.
Perhaps it could be flash-related
