when typing my cursor disappears and i have to retype words
when i am typing anything suddenly the cursor line disappears and anything i have typed after then doesnt appear, so i have to click the mouse again to carry on typing. i have noticed that when this happens the minimise and close squares in the top right of the screen change to plain black background. it has happened more than 7 times while i have been typing this.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the 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
- Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
- Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
- Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
There are other things that need attention:
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
- Next Generation Java Plug-in 1.6.0_18 for Mozilla browsers
Update the Java plugin to the latest version.
- http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)