Disable RC4 encryption in Firefox

This is probably a lot already written on blogs, but ... even though RC4 encryption is considered vulnerable, many websites still use it by default, and Firefox displays such connections as using a "high degree of encryption". Fortunately, we can disable RC4 support in Firefox settings.

1. Open the settings page at about: config.
2. In response to the warning that you can "lose the guarantee", we reply that we will be careful.
3. In the search bar at the top of the page, enter "RC4".
4. As a result, we see various cipher combinations using this standard (there should be 6 entries with the type "logical" / "boolean"). Switch each double-click to the value "false".
5. Enjoying the result.

Naturally, if the site only supports RC4, a connection error will occur. But, most likely, you do not need to go there.