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Firefox ESR doesn't start at all with specific profile: [Child][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost

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Hello! I am running firefox-esr version 68.5.0esr-1+b1 (from Debian testing) with a bunch of extensions (ublock origin, multi containers, suspend tab, open in browser, all in one sidebar, etc). Yesterday, I was suddenly unable to start firefox. I can see the profile manager and start another older profile, but not the one I really need to open. When I start from a terminal, I see this error message most of the time:

 ###!!! [Child][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost

I have created a new profile and started it with success; after copying all files from the faulty profile, the new one does not start.

I have tried to run with safe mode: still does not start.

I have found which doesn't help. shows me how to copy bookmarks and cookies over. (I am not using any synchronization service.) I would very much like not losing my session (open tabs), but I don't know which file or database is holding it.

I would prefer not to have to spend a lot of time reinstalling and reconfiguring all extensions, but maybe it will be necessary. Thanks for any help troubleshooting this.

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Version 68.8.0esr starts normally, with session, extensions and profile intact.