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Has anyone noticed in FireFox 4 a bunch of errant lines appearing in text boxes and search fields... especially when you erase text?

For me, the moment I start type (whether it's in a Google search bar, or here in this text box) a bunch of vertical lines appear after the blinking cursor, sometimes through text, or at the end of word wrap lines. If I erase, it copies the cursor all the way back, leaving black, brown, or gray lines in it's wake. Very annoying.

Has anyone noticed in FireFox 4 a bunch of errant lines appearing in text boxes and search fields... especially when you erase text? For me, the moment I start type (whether it's in a Google search bar, or here in this text box) a bunch of vertical lines appear after the blinking cursor, sometimes through text, or at the end of word wrap lines. If I erase, it copies the cursor all the way back, leaving black, brown, or gray lines in it's wake. Very annoying.

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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).


In Firefox 4 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.