The cursor jumps to a different section of the page when typing
Whenever I type either in emails or on web pages, while typing the cursor either jumps to an earlier section of the text I am typing and my text appears there, or the view of the page jumps to the end of the page.
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).
- Don't make any changes on the Safe mode start window.
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
In your More system details...
Next Generation Java Plug-in 1.6.0_15 for Mozilla browsers - you should update to the latest 1.6.0_22 version of Java.