Originally Posted by Gregg Bell
(What's "it"?)Then I exit Firefox and open it again and the black line is gone?
"it" specifically is the configuration element
Open a new tab in your browser and type "about
:config" without the quotes.
Search for gfx.xrender.enabled
Right mouse click this value in your config editor and select T
This will turn the element's property
value to false
Close the configuration editor tab.
Restart browser and you should be good to go.
a picture is worth a 1000 words
Here's what your may look like before changing this property's element value to false.