No longer working in Developer Edition 136.0b6 - `ChromeUtils.import is not a function`

[max-kamps]

I'm running Firefox Developer Edition 136.0b6.
The about:sync page appears completely blank, and trying to open it prints the following error message to the browser console:

Uncaught TypeError: ChromeUtils.import is not a function
    80           chrome://aboutsync/content/build.js:2
    n            chrome://aboutsync/content/build.js:2
    939          chrome://aboutsync/content/build.js:2
    n            chrome://aboutsync/content/build.js:2
    <anonymous>  chrome://aboutsync/content/build.js:2
    <anonymous>  chrome://aboutsync/content/build.js:2
    <anonymous>  chrome://aboutsync/content/build.js:2

[mabox965]

Hello,
I'm running Firefox Developer Edition 140.0b9 and the about:sync page appears also completely blank.
Is there any news ?!
Thanks

[mhammond]

I don't have dev edition locally at the moment, but it continues to work on Nightly, and did when 140 was nightly. Are you sure you are on the latest version of the addon? Is there anything in the browser console?

[mabox965]

Hello,

I use the same latest version of the addon : 0.25.20250227.104629 for the both browser below

It doesn't work with Firefox Developer Edition 141.0b2 (64 bits)
It work with Firefox Nightly 142.0a1 (2025-06-25) (64 bits)

I don't know how to view the browser console (F12 and ...? or about:debugging#/runtime/this-firefox), if you can help me !?

Thanks

[skhamis]

Hi @mabox965, hmm so I downloaded Firefox Developer Edition 141.0b3 (aarch64) and can correctly see about:sync. However:

I don't know how to view the browser console (F12 and ...? or about:debugging#/runtime/this-firefox), if you can help me !?

The easiest way (via development edition) is click the wrench on the toolbar, then open the Browser Console and report any errors you see when opening about:sync