I've been using S3.Translate for a very long time, and I'm generally very happy with it.

However, it seems that since Firefox version 153.0.1, released on July 28, 2026, the “Translate Page" feature no longer works on YouTube. Now, the “Translate Page” feature forces a new tab to open with no text (only the video is visible), and the URL of this new tab looks like this: [Sorry, I can't type an URL since AMO refuses]

I close that tab and try again, and every time it opens this new, non-functional tab (with no text to translate).

I’d like to clarify that the feature I’d like to restore is page translation as it has always worked: IN the active tab, not in a new, non-functional tab.

I thought about trying “Translate the page via the Google Translate website,” but I get the same result.

It seems that S3.Translate with Firefox 153.0.1 can no longer translate the current tab.

As far as I know, I haven’t changed anything in Firefox in the last few days — no new add-ons, no new settings. I just accepted the 153.0.1 update from July 28.

The problem occurs on YouTube as well as on Instagram.
It doesn’t occur on “regular” web pages like Wikipedia, The Independent, IMDb...

Thank you for your work!