sweet, thanks Stealth

 

I've seen a similar issue. Occasionally Firefox will just spit out the raw HTML instead of rendering it. On digging deeper, I think it is an issue with cookies. #1, if you clear your cookies, it goes away. #2, I looked at the cookies and they seemed to be getting really long when this happened to me. The "content type" (which tells the browser it's receiving HTML) is sent in the headers along with the cookies, so if the cookies exceed a certain length, I guess Firefox could be cutting them off before it gets to the part where the web server tells it that it's sending HTML.

This did not happen before the migration as far as I'm aware. I will have a look at the cookie-setting code in the app to see if there is something amiss.