I think I might have just been living under a rock! Apps have been available for Firefox OS for mobile at the Firefox Marketplace for some time now. Later a preview for Windows and Mac was started and subsequently Linux too was supported.
What that means for Linux is that, a lot of web apps (behaving like native apps) would be available for the desktop Firefox users, just like the Google Chrome packaged apps about which I wrote a while ago. Not all apps are supported on desktop though.
The Wikipedia app:
Official description: Wikipedia Mobile for Firefox OS
The Soundcloud app:
Official description: SoundCloud is the world’s leading audio platform. Get the free app to discover and share music & audio you love. Join the community: connect on SoundCloud with friends and music & audio creators. Choose your favourite genres to launch your SoundCloud stream full of music & audio you want to hear. Get great content suggestions to help you discover new music & audio.
The Pulse app:
Official description: Pulse brings all your favorite blogs, magazines, social networks and newspapers in one place for FREE. Exciting to use, quick to read, ready to share. Pulse is a beautiful application that takes your favorite websites and transforms them into a colorful and interactive mosaic, making reading news fun and engaging.
Uninstalling the apps is very easy on Ubuntu Unity. Right clicking on the launcher icon shows up a “Uninstall App” entry, which uninstalls the app with a single click.
For other desktop environments, at least for the time being, the apps have to be removed manually, according to an answer in the Firefox forums:
Go to your home directory, look at the hidden files, you should see a directory like “.http;someapp”.
Remove it. This step removes the application from your computer.
Then go to ~/.local/share/applications and remove the file that looks like your app. This will remove the launcher from your desktop / start menu / activity view depending on your distribution.