How do I get rid of an error box that refuses to respond but blocks my scroll bar?

Question

error box says browser settings change. I don't understand what it means, but I also cannot use the choices to get rid of this box, blocking my scroll!
it goes 30 sec to about a minute or 2 then returns. I did malware & Norton scan
& figured it would be gone. not.
It reads:
Browser settings change. (yellow yield sign)
An unknown change was detected on your browser’s search settings.
Pick one:
Keep my current settings
I am aware of this change and approve it.
You cannot click either choice to get rid of it, it just sits there
You cannot click the yes box nor the red ‘close’ box
Nothing works except to go back to
The firefox symbol at the bottom bar,
Then you can see – for example – all 4 firefox windows-
And from there you can click that close button & it goes away
For a short while.

Answer 1

hello bowes, this sounds a bit like malware. please look out for any suspicious extensions (like 3rd-party-toolbars or things you have not installed intentionally) presently installed under '''firefox/tools > addons > extensions''' or the programs section of the windows control panel and remove those entries.
[[Troubleshoot Firefox issues caused by malware]]