When you say Native Host, do you mean PluginContainer? (I'm not familiar with the term). PluginContainer does end normally, but the firefox.exe process does not. Naturally, ending firefox.exe closes it and allows it to restart again. Here are all my extensions: Extensions Name Version Enabled ID Adb...

FDM 5.1.5.3224 FDM Plugin 2.1.2 Firefox 47.0a2 x86_32 (3/21/2016) Firefox Build Information: Source Built from https://hg.mozilla.org/releases/mozilla-aurora/rev/303576fae3933ed817545e5beb3d92128fe6caea Build platform target i686-pc-mingw32 Build tools Compiler Version Compiler flags cl 1800 -TC -no...