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.
Opaite Mbohovái (1)
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.