When I'm typing to compose an e-mail, the alphabets jump and I oftentimes lose a good amount of text already typed.
When I type, the letters shift (they jump from desired position to another position, i.e.: sometimes, the word jumps to the addressees tab, or some place else like down below the task bar.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.com/kb/Safe+Mode
In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If disabling hardware acceleration works then check if there is an update available for your graphics display driver.