Cannot type more than one letter in search box
I can't easily use the search box, either within websites or the top right google search. I type one letter and cursor de-activates. So if I do want to use it I have to type the letter then cliclick the next space with the mouse, then type the next letter, then click etc. I still have 3.5.8 for Mac as the problem first occurred when I updated to 3.6 so I re-installed the earlier version. Its now occurred in this one too. I have All In One Sidebar, xmarks and Web Developer installed.
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the Diagnose Firefox issues using Troubleshoot Mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
You should update your old "Shockwave Flash 10.0 r45" plugin. See ((Flash))