The latest Firefox version broke ChatGPT website

kmarc · 2026-01-16T13:53:21 1768571601

Unfortunate; This morning my firefox profile didn't start up, draws the empty window, and spins the CPU. I started my workday with downgrading FF and restoring my previous profile from a backup.

Now this.

FWIF, for this particular problem, the workaround from the linked reddit post works:

Edit 3: This workaround seems to fix it:

    type about:config in the URL bar
    search for network.http.accept-encoding.secure
    replace gzip, deflate, br, zstd with gzip, deflate, zstd

Alternatively, set network.http.dictionaries.enable to false.

6thbit · 2026-01-16T00:20:23 1768522823

Some request errors relate to "NS_INVALID_CONTENT_ENCODING". In such requests that is set to Content-Encoding: br

Did the new firefox break the Brotli encoding?

OptionX · 2026-01-16T14:56:12 1768575372

In about:config set network.http.dictionaries.enable to false to fix it.

source: https://github.com/webcompat/web-bugs/issues/201270

vanni · 2026-01-16T00:06:52 1768522012

https://bugzilla.mozilla.org/show_bug.cgi?id=2010712

https://github.com/webcompat/web-bugs/issues/201270

QuiCasseRien · 2026-01-16T13:28:59 1768570139

Two days and still no update for users, it's a shame at that level (of product scale) !

lobito25 · 2026-01-16T02:07:43 1768529263

I didn't update FF and have the same problem. I think it was the other way around.

daveoc64 · 2026-01-16T01:07:34 1768525654

I'm glad I'm not the only one with this problem!