I never liked Mozilla for a number of experiences: Their transition from an open source project to an organization receiving millions from the Google search box. The restrictions (based on security reasons) to install an extension from a site different than mozilla addons. For me this was a prequel of app stores. Mozilla Thunderbird team had no respect for people who reported bugs: they closed important bug reports.…
It would be interesting to receive replies instead of downvotes.
You can be both things. Generally it's nice to be paid for your work.
"The restrictions (based on security reasons) to install an extension from a site different than mozilla addons"
If someone convinces you to install a malicious browser extension (easily done in a world where people will click OK on basically anything) they can spy on and control everything you do online.