Failing connection attempts to multicast IPv6 ff00:::443 logged during NoScript updates

The same issue, but after update. #42280 (closed)

@ma1 ?

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Like #43297 (closed), a regression from non-persistent background scripts causing race conditions on startup / updates.

Again the connection attempt is not going anywhere on the network, being to a local multicast address, but attempts are observable until the main process machinery meant to block / redirect it is ready, which on updates is not guaranteed to happen before child process frames are injected and start trying.

Probably fixable on 12.x convergence by using switching to a persistent Manifest V3 declarativeNetRequest redirecting rule, like in Chrome.

added Doing label

Ok, can you update the title and link to the relevant release-prep when resolved?

added 13.5 stable 14.0 stable 14.5 stable labels

changed title from Weird XHR connection attempt to multicast IPv6 ff00:::443 on NoScript update to Failing connection attempts to multicast IPv6 ff00:::443 logged during NoScript updates

added Backport label

Fixed in 12.1.1 (now public).

closed

marked this issue as related to tor-browser-build#41318 (closed)

marked this issue as related to tor-browser-build#41319 (closed)

marked this issue as related to tor-browser-build#41323 (closed)

marked this issue as related to tor-browser-build#41322 (closed)

marked this issue as related to tor-browser-build#41316 (closed)

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