I'm not sure if I really understand where Mozilla is heading... I chose Firefox over Chrome because of a) secure password sync'ing across devices (real end to end encryption for cloud storage and master password for local storage) and b) addons on Firefox mobile version.
Recently they decided to implement another password sync'ing scheme as the old one (based on pairing devices) was apparently too hard to use for the modal FF user (stats showed that less than 1% of their userbase was using old sync). Unfortunately the new system is by design not nearly as secure as the old system. After a few weeks of enabling the new sync'ing tool I randomly noticed that passwords no longer got sync'ed correctly. Turned out that the new sync system does not work when a master password is enabled. No mention of this in the release notes, no warning message during installation.
With the new sync system we not only get less security by design, on top we're no longer able to locally protect stored passwords with a master password. That means that every malicious/buggy application on your computer is able to read _all_ your saved passwords in plaintext. Take a look at https://bugzilla.mozilla.org/show_bug.cgi?id=995268 for the details. Password sync'ing security is now at par with Chrome, so b) is now the only reason why I'm still staying with FF.
If you take the time to read the bug report it really feels that Mozilla is losing touch with the power users in their pursuit of the average user. They forget that power users influence the rest...
Anyway, I think it's rather ironical that they are doing this security thing while they are knowingly removing security features at the same time.