How can I block/get rid of the "Browser Settings Change" window?

There is this window that pops up in the corner of FireFox that I have encountered before but now whenever I click an option it will not go away. I have to go to the preview windows on the FireFox icon and close it that way, but it keeps appearing every 20 minutes or so. I'm getting very frustrated since I can't seem to make it go away and I would like to know if I can block it.

I know it isn't my anti-virus because the window for it specifically appears as FireFox.

I have restarted my computer a few times as well and it didn't fix it.

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