Encrypted Bookmarks Exporter от Anthony E.

This add-on aims to secure personal data contained in exported bookmarks.
Unlike standard build-in-browser exporting methods, it allows users to store bookmarks locally as encrypted file, preventing unauthorized access to stored bookmarks.

The code uses high-standard security encryption algorithms that encrypts a standard bookmarks HTML file into ciphertext, which can be read by this add-on only.
The add-on requires no internet connection and operates locally.

Please note that this add-on is experimental.
This program comes with absolutely no warranty.
This project is under the MIT License.
See the MIT License for details.

The code of this add-on is open source and located at GitHub.
Feel free to report any bugs or suggestions to the project issues page on GitHub.