I think it is good that Mozilla stuck to a geeky expression.
[1] https://blog.mozilla.org/opendesign/ [2] https://blog.mozilla.org/opendesign/now-for-the-fun-part/
The "eye" looks like either the Eye of Sauron (i.e. evil) or a stylized vagina (i.e. inappropriate).
The "connector" is cute but useless for branding because it becomes excessively generic.
The "open" looks like someone mixed a console icon with an insurance company's logo.
The "wireframe" is bland with weak typography.
The "impossible M" is appropriate for a conference but not a company. It also just doesn't work at smaller scales or with other colors.
The "flik flak" is not even a logo.
These aren't good designs for their purpose. The "moz://a" logo isn't good but it's vastly more appropriate than the rest of them.
I've been using Firefox since it's inception and the Communicator Suite before that. To me this just screams out as a plea for attention to the younger generations.
This is like some weird episode of Saved By The Bell where Mr Belding puts on jeans and a ball cap to try and fit in with Zach and Slater.
This kind of seems like the best of a bunch of mediocre concepts. Instead of having a design agency do the logos and then selecting from them, it would have been interesting to take designs from the community - surely some more interesting designs would have been proposed.
Mozilla hasn't been a product brand for a long time.