I have been trying to download Mobile for Android for weeks. Every time it then informs me "file not found." I'm about ready to quit trying since apparently I'm wasting my time. Does anyone have a clue what I'm doing wrong?

Firefox will not appear in the Market for most phones with incompatible hardware. You can check if your phone is supported here: https://wiki.mozilla.org/Mobile/Platforms/Android Even on some supported devices, a bug in the Market software prevents Firefox from showing up. This may be related to the fairly recent Android Market app update. If you go to Settings/Applications/Market and choose "Uninstall" you can uninstall the update, and then search for and install Firefox from the marketplace. Or, if you have a supported phone, you can download the app directly from here: http://ftp.mozilla.org/pub/mozilla.org/mobile/releases/4.0b3/android-r7/multi/ (Note: To download the app directly for an AT&T phone, you will have to search for instructions on "sideloading" the APK file, since AT&T disables the option to install from non-Market sources.)