See for further progress on this issue.

Can anyone who knows about JavaScript comment on the "this.location" of "location" as to which works in more browsers?

It seems that since the related bug was fixed, this one should also be fixed. Thanks, L

I've created which includes a patch to event(UsageSession stuff) to know about Firefox/Linux.

Ok after a bit of digging the problem seems to be that Firefox on Linux doesn't get detected by UsageSession as a know browser, this means chat decides to tell it to reload the whole tool frame rather than manipulating the DOM, however it attempts to do this with (ChatDelivery:136):

try { this.location.replace(addAuto(this.location));} catch (error) {}

Now under Firefox this.location isn't defined. The location property is available on the window or the document object. Replacing the refresh text with:

try { location.replace(addAuto(location));} catch (error) {}

should allow the fallback solution to work on Firefox (and other browsers).

However really UsageSession should return Firefox on Linux as a known good browser.