Hi, yes you can right click > Delete on any folder you do not want, but first be sure to open them and drag out any bookmarks you need into your Bookmarks Menu/Toolbar as required.

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Hi Scribe, did that and lost all my bookmarks! I still have them on my Firefox on android so can I import them from there and how? I'm scared that if I sync the two I'll lose them as well! Help.

Phone synced automatically and now all lost!