[tconfrey]

BrainTool[1] is a similar bookmarking extension that is open source[2] and syncs data to a plain text file (org-mode format) on Google Drive.

[1] https://braintool.org [2] https://github.com/tconfrey/BrainTool

[encryptluks2]

Looks very nifty. This is definitely more in line with what I was looking for.