Being disabled I use sticky keys and since Firefox 28 (even after Reset) the Alt key doesn't work as a sticky key and Ctrl fires twice eg. Ctrl-v copies twice.
This still happens after upgrading to FF 29. I have a 64bit Windows 7 system.
Initially, it seemed to be OK but after only a few minutes it was back to this behaviour. Other symptoms: 1. When I also have Accessibility Mouse Keys enabled, while typing it automatically switches the default click button to the Right button 2. Ctrl-t inserts 2 tab pages and Ctrl-w closes two! 3. everything works fine if used as normal ie. hold the Ctrl or Alt down while pressing the action letter..
Running in Safe mode with no extensions didn't help neither did using after Reset
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I found that after Firefox v29, a LOT of my settings and add-ons were changed /
reset. Try this;
Start Firefox in Safe Mode
While you are in safe mode;
Firefox Options > Advanced > General.
Look for and turn off Use Hardware Acceleration.
Check your setting. Then restart.
Sorry but it had no effect..
From your System Details, it looks like user.js is currently active in Firefox. The user.js file is only present if you or other software has created this file and normally it wouldn't be there.
You can delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release. You can get to the profile folder below:
- Help > Troubleshooting Information > Profile Directory > Show Folder
or
- Go to about:support and click Show Folder next to Profile Directory.
Note that your System Details list shows that you have a lot of prefs that are no longer supported in the current Firefox release, so you might consider to delete the prefs.js file to reset all the prefs.
After removing the user.js file and old and current prefs.js files then restarting FF, the problem still persists :(
See reply to previous suggestion