I would like to switch from Firefox to Chromium (it seems to be faster for my system) and I have a large number of bookmarks I would like to import into Chromium. I looked at this question: Can I sync bookmarks between Firefox and Chromium? but that seemed to be specific to Firefox Sync, which I don't have. I just want to import my bookmarks from Firefox into Chromium.

However, when I go to the Customize and Control button and then choose the option Import Bookmarks and Settings under the Bookmarks menu item, it gives me this:

I have Firefox and Chromium as up to date as the official repositories (I believe), so I really have no clue what is going on.

I have attempted to import directly from HTML, but it only imports the first set of bookmarks, nothing beyond that (where all of the bookmarks I really want are.)

Can I import the JSON Firefox backup file into Chromium, or am I stuck manually entering all of these bookmarks into Chromium?

Thanks!