This is exactly what I was looking for! Just a simple little add-on that makes visual a selection (one folder) of my bookmark tree, while keeping my Firefox bookmarks intact. I love every single feature: the bookmark-folder-selection, choosing a background colour for the new tab, the ability to resize the page window before taking the snapshot for the thumbnail, and the ability to move or delete the bookmarks right on the tab. Wonderful!

Just plain didn't do anything. And for an add-on that wants this many permissions, that's concerning.

This add-on simply displays a black page and is unusable. I'll leave a comment to avoid installing this addon again.

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No thumbnails, no sorting feature, homepage doesn't take you to the bookmark page.

Useful extension thanks! …it would be nice to have an option to replace the website thumbnails with website favicons (for me since I have many bookmarks on the page, it would be easier). Would also be nice to have a few built-in options to quickly change the style. Like a solid background option under the name (instead of a gradient) and an option to change text size & color. Also a quick filter search field at the top that would hide bookmarks as you type would be a great plus. Anyway, still good as it is, thanks a good luck!

Useless

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Very useful, since Firefox doesn't show bookmark thumbnails anymore. Simple configuration options.

Works, but difficult to update thumbnails (was expecting it could be done all at once)

Don't bother. Doesn't work at all.

Useless! Nowhere is there instruction as to entering a bookmark into the add-on. Useless!

Práctico, rápido, miniaturas sincronizadas con los marcadores de firefox, es justo lo que estaba necesitando. Gracias.