Re: Retrieving a webpages shows a blank screen when a 4xx HTTP status is returned. Not helpfull.

On 21 Jan 2021 11:45:35 +0100 R.Wieser wrote:
>Dave,
>
>
>I've just taken a peek, and that page indicates that the latest version 
>/should/ be running on FF v48 and upwards.  Which, alas, it doesn't.
>
>The other three versions, with dates of one month prior, say the same ...
>
>I've just installed the oldest, v1.0 version and although I have its icon 
>in the toolbar it doesn't display the HTTP status anywhere that I can see.
>
There's no min version in the manifest. Perhaps 48 was the first version 
that supported WX - it doesn't mean it ever worked with 48, or 52. What 
Fx version was current on the v1 release date?

Do you get any console errors?

You could check on MDN when the APIs were introduced, e.g.
browser.webNavigation
and the statusCode property

-- 
(Remove numerics from email address)