Why does Firefox work so poorly with Twitter compared to Opera?
When typing in the "What's Happening?" field on Twitter, my Netbook (Intel Atom n450) cpu goes straight up to max frequency and heavy utilization and stays pegged there until, apparently, the whole SoC (System on Chip) crashes and screen flashes white. Also there is heavy lag as I enter characters faster than they get displayed. I installed Opera web-browser on my Netbook and typing on Twitter is just like typing in Notepad with Opera. I'm guessing that something about the way that Firefox processes the javascript of Twitter in regard to character counting/scanning etc. is causing unnecessarily extreme cpu load.
URL of affected sites
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It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in safe mode (don't forget to select Disable all add-ons when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See this article for information about troubleshooting extensions and themes and this one for plugins.
If you need support for one of your add-ons, you'll have to contact its author.
If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.