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Failed to assume control of Firefox (Communication with browser failed)

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Posted on by TheAnker

Hello everyone!

I've encountered "Failed to assume control of Firefox (Communication with browser failed. Your current version of our web extension is outdated)" error in PAD. My flow opens a Firefox instance with defined URL successfully, but then throws this error. Made everything step by step as in this article. Even clearing the cache/cookies and reinstalling the web extension didn't help. Thank you for the help in advance.

PS: The version of PAD is 2.51, and I am running it on Windows 11.

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Power Automate Desktop

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VishnuReddy1997 2,652 Super User 2025 Season 2 on at

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Failed to assume control of Firefox (Communication with browser failed)

Hi @TheAnker,

Please try to restart the system,i will mostly resolve your issue.

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy

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PG-12120658-0 2 on at

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Failed to assume control of Firefox (Communication with browser failed)

Hello,
I have exactly the same problem as TheAnker, except that I am using Windows 10.
Restarting my system did nothing for me.
The previous version of PAD worked fine.

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SJ-12120847-0 3 on at

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Failed to assume control of Firefox (Communication with browser failed)

I am experiencing the same issue. I have tried all the recommended solutions, but it is still not working. However, the older version of Power Automate Desktop works fine without any issues.

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TheAnker 92 on at

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Failed to assume control of Firefox (Communication with browser failed)

Hello @VishnuReddy1997. I've tried restarting my system, but it didn't help, neither log out and login back in to my account in PAD.

I solved the problem by downgrading Power Automate Desktop to v2.50.132.24326, which I got from Microsoft website (MSI installer, for everyone who has the same issue, scroll down to find the link). Probably the issue was in the new v2.51 update.

Thank you everyone for your responses.

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CU13120320-0 6 on at

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Failed to assume control of Firefox (Communication with browser failed)

The very latest version of PAD available on the portal is 2.51.231.2433. The latest Edge add-on is version 2.51.025. The latest Firefox add-on is 2.50.0.24. Perhaps it is a coincidence, but "2.51" is common to both latest PAD and Edge add-on version numbers. It would appear Microsoft is yet to release a "2.51" Firefox ad-on.

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JZ-16121053-0 2 on at

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Failed to assume control of Firefox (Communication with browser failed)

@@TheAnker how did you manage to download v2.50.132.24326?
When I use the MSI installer from the website you suggested, it installs v2.51.231.2433.
Thanks for your help.

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eetuRobo 4,161 Super User 2025 Season 2 on at

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Failed to assume control of Firefox (Communication with browser failed)

Here are some older versions of PAD including 2.50.132.24326:
Releases · jfevia/Power-Automate-Desktop

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SK-16121326-0 2 on at

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Failed to assume control of Firefox (Communication with browser failed)

In 2.50.132.24326 also we have the same issue.

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TheAnker 92 on at

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Failed to assume control of Firefox (Communication with browser failed)

@JZ-16121053-0 use this link to previous PAD versions on Github (thanks to eetuRobo)

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TheAnker 92 on at

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Failed to assume control of Firefox (Communication with browser failed)

SK-16121326-0 mine still works fine on v2.50

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