FireFox+Nextcloud 15 Sync shows a 404 not found error since upgrade to fx 65.0/66.0

[rcmcronny]

Bug report

Steps to reproduce - current behaviour

Type in the unlock passwort, a field above with the message

" Invalid response: 404 Not Found"

is shown and the database is NOT unlocked.

What is the expected behaviour

Type in the unlock password, the matching elements should be shown

Additional remarks

Browser Console shows:

_Invalid response: 404 Not Found popup.build.js:8:268736
unlock moz-extension://d57aaab5-e3fd-49a4-960b-20a976f36585/build/popup.build.js:8

Sicherheitsfehler: Inhalt auf moz-nullprincipal:{9855ef58-6578-44fd-8ae0-96f252ad4ff4} darf keine Daten von moz-extension://d57aaab5-e3fd-49a4-960b-20a976f36585/build/popup.build.js laden.
NS_ERROR_DOM_BAD_URI: Component returned failure code: 0x805303f4 [nsIWebNavigation.loadURI] viewSource-content.js:284_

Environment

Operating System: Linux Gentoo Desktop
Browser: Firefox 65.0about:version)
Storage: Nextcloud 15

Before the upgrade to firefox 65.0 this worked, so it ha to do with the upgrade i suspekt.

[rcmcronny]

the same issue is with firefox-66 now, any fix or hint ?

[henryptung]

@rcmcronny Are you using the shared link provider? If so, you may want to take a look at #307 and #308.

[rcmcronny]

nope, i use the WebDAV provider with the suggested secured meassures.

[fengelhardt]

I first got the same 404 message with my WebDAV database. It have removed my database and tried re-adding it, but I now get an error in the "Manage Databases" tab:

Error: Cannot request origin permission for https://<my WebDAV URI> since it was not declared in the manifest

Maybe some security policies have changed in Firefox? Or maybe a Nextcloud issue?

[subdavis]

This has been fixed by #357, but not yet pushed to the Firefox addon store.