This was a great suggestion, and so I tried it. I installed Firefox Release 73 on my Mac. I went to my site’s texts and changed the js.browser_update. You can see the 2 screenshots. Firefox 73 seems to be giving me the right result (unsupported browser), but the site text is still the default, not the updated version I put in. Do I need to restart the container or rebake something for the change in js.browser_update to take effect? I thought it might be my CDN cache, but I cleared the cache and it’s still showing the old text.
My setting:
My result in Firefox 73.0:
