I think bookmarks.html doesn't keep important for my uses data like tags. It also uses an HTML syntax specific for this use.
~/.mozilla/firefox/PROFILE/places.sqlite keeps bookmarks and history
with all their data. ("PROFILE" is a random-looking name, usually with
.default.) https://developer.mozilla.org/en-US/docs/The_Places_database
documents what it has, it's easy to get some data using SQLite if you
know SQL.
I have a big recfile (https://gnu.org/software/recutils/) with my
bookmarks exported from various browsers (via an ugly script
http://hg.mtjm.eu/forget-scripts/file/tip/forget-import-places.py),
stored in a Mercurial repository. I don't keep the bookmarks in the
browser after an export: it's slower and less convenient than browsing
(without rec-mode yet) the bookmarks recfile in Emacs.
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