Re: It is possible to install an android application on a firefox OS phone?
Android applications are packaged in .apk files, similar to how Java turns apps into .jar files. They contain compiled Java code that only runs on Android.
FirefoxOS apps, as far as I know, are packaged in .zip files and is just a bundle of web-files (HTML, CSS, JS) that are unpacked during installation.
Therefore they are not compatible.
However, if the Android app was developed using web technologies and abstraction platforms (like Titanium and PhoneGap), the developer could export the files minus the platform, and with little modification of the API used, could deploy it on FirefoxOS. However, this job is for the developer and not for the client to do.
Some apps are just "thin clients" of their parent website. One could skip the app and just go to their website. Some of these sites are already mobile-ready and are essentially "mirrors" of their mobile apps (like The Verge, Twitter, Facebook).