Is it possible to show only 400 errors (or all errors) in the Firefox browser console?
There are usually a few hundred requests in a typical web page, most with 200 (OK) status. It'd save time by filtering those out to only display errors (400, 404, 403, 500 etc) which require investigation.
I know it is possible to sort by the Status column but filtering by Status number would be better in many cases.
(Chrome once had such a filter but it no longer seems to exist).
this is something quite simple when you know where to look for. I too looked for it for a while before stumbling upont it by chance.
First thing, you need to locate dthe "Filter URLs" near the top of the Network Tab.
Then you just need to type in "404" and it should auto-suggest the insertion of "status-code:404". There you go, as simple as this.