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Help un-merging two Firefox (Sync?)

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I use Mozilla Firefox browser on my work laptop, and have it Sync'd to my iphone. Yesterday my sister opened Firefox, logged me out, and logged herself in, to access some things. But instead of closing my profile (bookmarks, saved PWs, etc.) it MERGED hers with mine. Now, on our laptops and phones, we see each others bookmarks, saved PWs, etc. How can I unmerge them? Pls help!

I use Mozilla Firefox browser on my work laptop, and have it Sync'd to my iphone. Yesterday my sister opened Firefox, logged me out, and logged herself in, to access some things. But instead of closing my profile (bookmarks, saved PWs, etc.) it MERGED hers with mine. Now, on our laptops and phones, we see each others bookmarks, saved PWs, etc. How can I unmerge them? Pls help!