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Hi! I think it's unfortunate that firefox dropped support for the DBUS NetworkManager listener a few months ago, because now the offline support of firefox is not in sync with other linux desktop applications that use NetworkManager. It seems that current firefox behaviour is to check for netlink events and to report that the connectivity is available when _one_ network interface is up and running. firefox should benefit from the richer NetworkManager connectivity checks, allowing to make the difference between a CONNECTED_GLOBAL and a CONNECTED_SITE situation (captive portal for example). I noticed that firefox proposes an alternative captive portal detection via a dedicated URL (http://detectportal.firefox.com/success.txt). This detection didn't work for me, and even if it worked, it would duplicate the work of the NetworkManager. I use the network.offline-mirrors-connectivity flag set. Other configs have default values.
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle. Changing version to '26'.
This message is a reminder that Fedora 26 is nearing its end of life. Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 26. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '26'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 26 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.