Here's an entirely different meaning to the "closing" of a Metro app:
http://www.zdnet.com/mozilla-abandons-development-of-metro-firefox-for-windows-8-7000027346/
Mozilla frustrate me to no end with the decisions they have been making for the last few years now.
They're wasting development on Australis - a project that should have been cancelled years ago. It's been taking too long, breaks compatibility with a huge number of extensions and customizations, strips the browser of its identity (just looks like Chrome now) when I last checked on it all the new graphics were bitmapped and did not scale to retina resolutions (worse than the current Firefox UI) the new look is out of place on Windows and Linux, only looking at home on Macs.
Most of the UI/UX decisions seem to be handled by one or two people that only care about their specific use-case, but those people are not content with ruining the UI, they are intent on removing all the customizability that made Firefox great. You don't like the add-on bar? Well that's fine, it was disabled by default anyway. Oh no, we have to remove it because
we don't use it at all, therefore no-one can. Let's ignore that its removal breaks features in a lot of add-ons.
(I don't keep it visible, but some of my extensions require the use of it)
Firefox UI/UX development went seriously downhill when their lead developer left a few years ago.
Browser sync has now been made less secure with the latest revamp in order to make it "simpler" when the real problem with sync is that it's slow to make changes, and only syncs half of the data you want. It syncs your add-ons, but not your settings for them. You can restore an individual tab from another device, but not sync the entire session over etc.
Frankly, I don't know why they're even bothering with these Sync changes when they pulled the iOS Firefox Sync app down from the Apple store years ago (it was limited but it
worked) so there's no way to access your bookmarks/tabs on any of these devices at all now.
They had a "Firefox" branded browser planned for iOS but then cancelled it, just like them wasting two years of development on Metro Firefox and cancelling it now.
They had a fully working 64-bit version of the browser, and cancelled it.
Then they brought it back, but decided that you could only get it on the nightly branch, and disabled auto-updates for 64-bit builds.
After all, it's not like anyone on the nightly branch would want their browser to update itself.
Firefox is likely to remain my browser of choice for the moment, but they're making it difficult, and I've been pushed back from running the Nightly builds to using the extended support builds, hoping that they will get their act together before they push Australis into the release versions.