How to add bookmarks to Firefox Navigation bar:

1. step: The bookmarks you want to have on the Navigation bar go into the Bookmarks bar.

2. step: Show both, Bookmarks and Navigation bar.

3. step: activate ‘Customize…’ to customize the Navigation bar. Drag ‘Bookmarks bar Item’ onto the Navigation bar. Close customize.

4. step: Hide Bookmarks bar.

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via [all variants] How can I add bookmarks to Firefox Navigation Toolbar OR Tab bar – Page 2 – Ubuntu Forums.