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Firefox and thunderbird crash on startup after clean reinstall

Firefox 疑难解答
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Both firefox and thunderbird crash directly to the "Mozilla Crash Reporter" on startup. This also happens in safe mode.

So far I re-installed firefox through the package management (first completely removed it including configuration files, then installed it again). The profile created by the re-install is still completely empty, there is no data from the original profile and no plugins.

The button to automatically add troubleshooting information doesn't work for me (probably because I'm using chrome now), so I'll try to add relevant information. If anything is missing, please ask.

Firefox version: 55.0.2 Crash ID: bp-ced2e336-0d1a-40a4-9f45-e88b70170913 OS: fully updated Ubuntu 17.04 (64bit) Graphics: Intel HD 5500

Both firefox and thunderbird crash directly to the "Mozilla Crash Reporter" on startup. This also happens in safe mode. So far I re-installed firefox through the package management (first completely removed it including configuration files, then installed it again). The profile created by the re-install is still completely empty, there is no data from the original profile and no plugins. The button to automatically add troubleshooting information doesn't work for me (probably because I'm using chrome now), so I'll try to add relevant information. If anything is missing, please ask. Firefox version: 55.0.2 Crash ID: bp-ced2e336-0d1a-40a4-9f45-e88b70170913 OS: fully updated Ubuntu 17.04 (64bit) Graphics: Intel HD 5500

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选择的解决方案

I started thunderbird with gdb and strace which showed that it was accessing "/usr/lib/flashplugin-installer/libflashplayer.so" just before crashing. I uninstalled the package "flashplugin-installer" and both firefox and thunderbird start up normally again.