Firefox Flashing Cursor in Webpages 'Problem'

Do you have a problem in Firefox where the flashing cursor appears in a webpage? Where the 'Home' and 'End' functions seem not to work? Where the up and down arrows seem to work inefficiently or not at all?

And where you don't know what you can do about it?

It happened to me after I'd banged my keyboard against my head to generate some random text in an e-mail, to make it look like I was banging my keyboard against my head.

I thought I'd broken something in the hardware, maybe in firefox (since that was open, running Gmail at the time).

What it was though was that I'd inadvertently turned on the accessability function 'browse with caret' (for selecting text with the keyboard (useful for laptops, etc.) by pressing the F7 key.

This Ask.Metafilter page citing the problem: "I've noticed that clicking on the page itself now brings up a flashing text cursor - that never happened before. Plus, arrow keys now just move the cursor up and down." solved the mystery.

Hurray for AskMe!