FF sometimes emits malformed requests (Accept-Language contains a line break) == > error 400

A few days ago, I started to get 400 errors on some sites (not all). I would get errors of

-snip-
Bad request

Your browser has requested that this server could not understand.
Request header field is missing ':' separator.

q=0.8,en-CA-x-Rogers;q=0.8,en-IE;q=0.7,it-it;q=0.7,it;q=0.6,es-ES;q=0.6,ES;q=0.

-snip-

I discovered that FF was sending a malformed request - notice how the Accept-language header is broken by a single line break. (I have fact/r and / n visible.)

-snip-
GET / HTTP/1.1\r\n
Host: www.thestar.com\r\n
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; RV:17.0) Gecko/20100101 Firefox/17.0\r\n
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n
Accept-Language: en-US,en,en-ca;q=0.9,en-gb;q=0.9,fr-FR;q=0.9,fr;q=0.8,fr-ca\n

q=0.8,en-CA-x-rogers;q=0.8,en-IE;q=0.7,it-IT;q=0.7,it;q=0.6,es-ES;q=0.6,es;q=0.6,ko-KR;q=0.5,ko;q=0.5,is-IS;q=0.5,is;q=0.4,de-DE;q=0.4,de;q=0.4,cs-CZ;q=0.3,cs;q=0.3,ru-RU;q=0.3,ru;q=0.2,ca-AD;q=0.2,ca;q=0.1,en-AU;q=0.1,pl-PL;q=0.1 pl;q=0.0\r\n

Accept-Encoding: gzip, deflate\r\n
Connection: keep-alive\r\n
\r\n
-snip-

I tried the suggested steps: empty the cache/cookies/active connections/off line data Web site closed FF, deleted the file cookies.sqlite, rebooted. The problem persists. The only clue is the Accept-Language malformed header.

It's not fun to have a paralyzed FF. Thanks for your help.

Must you really all these languages?

Tools > Options > content: languages-> choose

Tags: Firefox

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