Detect browser crash/model instability for suggesting a reload

[wingman-jr-addon]

Use API https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/reload

This would be a partial mitigation to #123

[wingman-jr-addon]

I initially labelled this as high because the crash is annoying. While things seem to work after that, it's not clear to me when exactly things stop working - and in fact, it may be other issues like putting the computer to sleep that cause issues.

However, in looking again at the about:addons UI, probably it is best to just have the user do a disable/enable for reload. Now if I could detect a crash and then suggest a reload, that would be a different story...