They are using a browser fork that isn’t being maintained, so any current vulnerabilities it has will likely not be solved, including the one i know of that is currently being exploited and was fixed in firefox over a year ago.
I’m not saying that Firefox and other forks of it won’t get vulnerabilities, but as they are maintained, and this goes especially for Firefox which they are forks of, the vulnerabilities will likely be fixed in a timely manner.
If you get this level of paranoia, better not to use any FF related browser: https://grapheneos.org/usage#web-browsing
What is paranoia about it?
They are using a browser fork that isn’t being maintained, so any current vulnerabilities it has will likely not be solved, including the one i know of that is currently being exploited and was fixed in firefox over a year ago.
I’m not saying that Firefox and other forks of it won’t get vulnerabilities, but as they are maintained, and this goes especially for Firefox which they are forks of, the vulnerabilities will likely be fixed in a timely manner.