Examples of the issue please.

Do you mean the built in or an add-on is not working? Here is what I see. see screenshot

Did you check Browser Console?

• https://firefox-source-docs.mozilla.org/devtools-user/browser_console/

Maybe due to Bug 1882334?

You can run mozregression to find the change responsible.

Here is a screenshot of a Spanish website. If I click on the translator in the address bar here is what I see. No languages are in the pulldown menu

Do you see any errors in the Browser Console (Ctrl+Shift+J) when this happens?

Here are the errors. I'm not sure if they happened when I tried to use the translator or if they happened previously when Nightly was opened.

Follow up. Translator appears to be working again with the 125.0a1 update

I spoke to soon, the translator issue was present on German eBay. So, it is only an issue on some sites.

You can check the Browser Console for relevant-looking messages.

• https://firefox-source-docs.mozilla.org/devtools-user/browser_console/

Still not working after the last update. Here is eBay France on Nightly browser and on Firefox browser.

Sorry, I don't know what is meant by "relevant-looking messages" in browser-console. What am I looking for?

Does it still happen in a new profile? Alternatively you can refresh your existing profile. Make sure you stay signed out of your sync account when testing.