There needs to be a message stating that your browser crashed and all plugins have been disabled.
Afaik plugins are not disabled, only extensions. And there used to be a warning about it.
I spent ages trying to fix a flash problem and it was because it was disabled.
As i said, i don't think it was disabled due to a crash.
Also note if you disable the plugin it keeps asking you install flash.
It's because the plugin caný be detected if it isn't enabled.
The information of version which plugin you have and which version should still be possible to be retrieved even if the plugin is disabled. I don't if the problem is with the flash installer or the browser?
The problem is with the web. If you don't have Flash enabled then a page that uses it will ask you to install the flash player.