Not really a question, more of a plea...
Firefox 18.0 crawls on my machine. Not the browsing as such; that's only a little slower than 17.0.1 (still noticeable). I'm talking about opening and traversing menus and entering text in text fields on sites. I had to go back to 17.0.1 as it was just too annoying. This is on Linux Mint Debian Edition (Debian Testing), using the nl localized Firefox downloaded from the Mozilla site. Switching off extensions and/or using a new profile didn't help. If this doesn't get any better in following versions, I'll have to look for another browser when 17.0.1 becomes too old. Please don't make me do that. I've just tried Chrome and quite frankly, it's a bit of a joke...
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Try to Turn off hardware acceleration, and check it again (in safe mode hardware acceleration is disable).
Please let us know if any of these tips solve your problem
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
Look at my original post. A new profile has already been tried. And even though I fail to see how disabling the firewall could affect building and traversing Firefox's menus (which is where the slowness is most annoying), I switched off iptables just to be sure. No change of course.
Sorry about those suggestions. I appear to have missed that you are on Linux.
Any luck with disabling IPv6?
Downgrading didn't make any difference and neither did disabling protected mode (assuming adding the command mentioned to /etc/adobe/mms.cgf did the trick).
Thanks for your suggestions anyway.