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⚠️ Avoid #-based browsers: Websites can detect what addons are installed by fetching their web-accessible resources. Try yourself: https://z0ccc.github.io/extension-fingerprints

This is yet another possible way of # users all across the internet. However, there's a simple solution: Just use #.

Since the IDs of Firefox extensions are unique for every user, it is not possible to know or guess the addresses of their web-accessible resources.