I want to make it stop.
_Ko0LaiD_ you have caret browsing on! This allows you to click somewhere then use the shift and arrow keys to select stuff! Good for selecting a lot of text on long pages.
Press F7 again to turn Caret Browsing off.
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That is so much better.
Just a shot in the dark, but you could try installing Ad-Block Plus (it's a Firefox add-on) and see if it goes away. Even if it doesn't fix your current problem, it's a handy add-on, I haven't seen an ad in months.
Where is it on the pages and does it flash highlighted or on-off like a cursor?
On and off like a text cursor like when you are typing. Firefox 3.5.1
Bizarre - just web pages? Looks like a graphics fault, but I only say looks like.L
I clicked Near the instructables logo, and flashing text line came up.