I am on Pop-OS and have downloaded and installed firefox developer edition (formerly aurora) under
/opt/firefox. Note, the PPA for aurora is outdated and no longer works (to my knowledge).
Now firefox developer edition is saying there is an update. So I followed this link: https://support.mozilla.org/en-US/kb/update-firefox-latest-release
which shows how firefox should auto-update itself. However, on linux this is not the case. Instead I have to follow the link which instead of showing me the update file, only lets me download all of firefox again.
There has to be a better way to update firefox developer edition on linux, than downloading and extracting it to
/opt/firefox every single time.