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I'm trying to determine if this is something happening in the browser itself or some terrible function of certain websites, but several times recently while using Firefox, webpages regularly refresh themselves. Is this supposed to be happening, and how do I make it stop? I'm on iOS Firefox 117.3 (34056).

I'm trying to use tabbed browsing. The instructions say, "tap the tab icon at the bottom of the screen", but at the bottom of the screen I only see back arrow, forward arrow, trash can, and three bars for menu.