There's no way to delete extra Separators in Bookmarks...
Inside the Bookmarks menu and just under the heading "Bookmark This Page" there's 2 separator lines, both adjacent to each other. There's no way to select or otherwise delete the extra one.
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Are you using an extension like Menu Editor or code in userChrome.css to hide menu items in that Bookmarks menu?
no I'm not
Are those separator lines visible in the Bookmarks Manager (Library)?
- Bookmarks > Show All Bookmarks
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
- Do NOT click the Reset button on the Safe mode start window or otherwise make changes.