Better Offline Mode

Overview

Historically, Firefox and other Mozilla-based products have not handled disconnected operation, flaky network conditions, or network configuration changes well. Several extensions help to ease some of these problems, but it would be nice to have something built into Mozilla to better deal with these sorts of conditions.

Low-hanging fruit

• Do not discard cached content when we have a network connection failure. (bug 189570 and bug 278007)
• Automatically reload PAC file when changing networks, or at least reload the PAC file when we encounter a network connection failure. (bug 243277 and bug 125875)

Nice to have

• Detect offline/online state changes from OS, and put browser in offline/online mode. (bug 76111 and bug 312793)