I installed an extension irvanview8792. It was not irvan view but installed a photo behind each item on menu bar

I can't find urvanview 9582 to uninsatall. The picture that is behind very menu bar item makes it almost unreadable, e.g. tools, help, etc. I have looked for a way to uninstall the extension in hopes that might solve the problem. I can't find a way. I'm now concerned this may have installed a rat program. I'm thinking may best course may be to uninstall firefox and start over, Would appreciate any help.