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.

Start Firefox in <u>[[Safe Mode]]</u> 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
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
In Firefox 4 and later [http://kb.mozillazine.org/Safe_mode 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.

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