Drop obsolete references to HTTPS Everywhere and fix deleting uBlock from the Unsafe Browser

intrigerirequested to merge
clean-up-https-everywhere into stable

We were inheriting HTTPS Everywhere from Tor Browser, which stopped including this extension.

While doing this work, I noticed that the way we were attempting to delete our other extra add-on from the Unsafe Browser was outdated, so I fixed that, and removed a workaround we had put in place back when it became outdated.

Edited by intrigeri

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