Image URLs not restored/imported for Base64 encoded images

[CellsReinvent]

I use base64 text for thumbnails in my config. When I backup the config in FF and restore it Edge or Chrome, the Thumbnail URLs are blank. Some things are restored, like custom theme. The Thumbnail information is definitely in the export json file, but they not restored on import.

[tborychowski]

this is by design (unfortunately).
in the exported file, the images are associated with IDs of the bookmarks, but if you import them in another browser, the IDs will be overwritten, and hence - the association will be lost.

I tried using another field (like url) to associate the exported thumbs with their bookmarks, but that had other issues (can't remember now what it was).

I suppose a proper way would be to write some sort of a smart matcher, but unfortunately, I have neither time nor motivation to do that :-|
(out of ~1000 daily users, yours is the first request for this).
It would also have to be an option (e.g. export thumbs by bookmark ID or URL), so that the current functionality remains as default.

Maybe someday :-)
(unless you or someone else will make a PR)