That's not a homepage that a Firefox installer default page.

Then how do I change it to a homepage? I have firefox homepage selected in my settings. Screenshot attached.

Click on the wheel on the lower right of the browser and see what it gives for options.

Recent Activity can show bookmarks you added recently, pages you visited recently, recent downloads, and pages added to Pocket. I can't recall which ones are shown by default, but presumably you have at least one of those? If it's a private window, though, maybe not. (You can force Firefox to run in automatic private browsing mode by selecting the "Never Remember History" option.)

Regarding Pocket, do you use AVG? Another user mentioned that AVG may currently be blocking access to Pocket.