I've tried to reproduce this on 106.0.2 using mozregression on Ubuntu 22.04.1 LTS with no success. When I disconnect my Ubuntu box from the internet, I get the "Check your internet connection" message. As soon as I reconnect to the internet the error message goes away. Tried to use a combination of VPN plus disconnecting from the internet, no luck there either. My guess is the reporter's network was in an odd state when first viewing Firefox View and ["this.networkIsOnline" got set to false](https://searchfox.org/mozilla-central/rev/2809416b216b498ec3d8b0e65c25a135f4f5f37d/browser/components/firefoxview/firefox-view-tabs-setup-manager.sys.mjs#70-72) but the ["NETWORK_STATUS_CHANGED" message](https://searchfox.org/mozilla-central/rev/2809416b216b498ec3d8b0e65c25a135f4f5f37d/browser/components/firefoxview/firefox-view-tabs-setup-manager.sys.mjs#317-318) never fired after the network adapter resolved its issues and so we're stuck in the "offline" state even though the browser is online. Otherwise, I have no idea how we're stuck on that "Check your internet connection" message...but it doesn't seem to have anything to do with virtual network adapters and what not.
Bug 1798333 Comment 3 Edit History
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I've tried to reproduce this on 106.0.2 using mozregression on Ubuntu 22.04.1 LTS with no success. When I disconnect my Ubuntu box from the internet, I get the "Check your internet connection" message. As soon as I reconnect to the internet the error message goes away. Tried to use a combination of VPN plus disconnecting from the internet, no luck there either. My guess is the reporter's network was in an odd state when first viewing Firefox View and ["this.networkIsOnline" got set to false](https://searchfox.org/mozilla-central/rev/2809416b216b498ec3d8b0e65c25a135f4f5f37d/browser/components/firefoxview/firefox-view-tabs-setup-manager.sys.mjs#70-72) but the ["NETWORK_STATUS_CHANGED" message](https://searchfox.org/mozilla-central/rev/2809416b216b498ec3d8b0e65c25a135f4f5f37d/browser/components/firefoxview/firefox-view-tabs-setup-manager.sys.mjs#317-318) never fired after the network adapter resolved its issues and so we're stuck in the "offline" state even though the browser is online. Otherwise, I have no idea how we're stuck on that "Check your internet connection" message...but it doesn't seem to have anything to do with virtual network adapters being enabled all the time (like Bug 1793498) and what not.