I’m running Ubuntu 11.04 (32-bit version) on my laptop ASUS K42J just couple weeks and regularly having issues with Firefox – it has freezes sometimes when you opened multiple tabs. The screen become to light cloudy appearance for about half a minute(or something like that), during this time you can’t do nothing. I had looked through some posts there and found several similar issues, but mentioned tricks with changing of Firefox’ options (deleting history e.t.c.) doesn’t help. I’ll be appreciated for any help on mentioned matter
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Use Flashblock to prevent unnecessary flash content from loading, AdBlock Plus to prevent ad servers from being contacted, Ghostery to prevent tracking services like Google Analytics. Disable "Block reported attack sites" and "Block reported web forgeries" in Firefox Security preferences. This will improve responsiveness and reduce locking. Optimizing databases will probably help as well. Also check my optimization and troubleshooting tutorials.
Make sure you have the latest driver for your video card installed.
How many tabs do you have open when this happens? Try to use tab grouping in Firefox to decrease their number