We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Funkcionalnosć toś togo sedła se pśez wótwardowańske źěła wobgranicujo, kótarež maju wašo dožywjenje pólěpšyś. Jolic nastawk waš problem njerozwězujo a cośo pšašanje stajiś, wobrośćo se na našo zgromoźeństwo pomocy, kótarež na to caka, wam na @FirefoxSupport na Twitter a /r/firefox na Reddit pomagaś.

Pomoc pśepytaś

Glědajśo se wobšudy pomocy. Njenapominajomy was nigda, telefonowy numer zawołaś, SMS pósłaś abo wósobinske informacije pśeraźiś. Pšosym dajśo suspektnu aktiwitu z pomocu nastajenja „Znjewužywanje k wěsći daś“ k wěsći.

Dalšne informacije

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Firefox upgraded and now I cannot access my email account. I get the message HTTP Status 400 - Bad Request. What can I do? I have used Firefox for years and years

Firefox upgraded and now I cannot access my email account. I get the message HTTP Status 400 - Bad Request. What can I do? I have used Firefox for years and years

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Here are a few steps you can take to try to solve the problem:

1. Clear the cache and cookies in your browser: Go to "Options" > "Privacy & Security" and click on "Clear Data". 2. Disable browser extensions: Some extensions can interfere with the website's functionality. To disable extensions, go to "Add-ons" and uncheck each one individually. 3. Examine for compatibility issues: Check the website's support page to see if there are any known issues with the most recent version of Firefox. 4. Access the website in a private window to see if the problem is related to your browser settings or extensions. To open a private window, select "New Private Window" from the three horizontal lines in the upper-right corner of the browser. 5. Disable IPv6: Some users have reported that disabling IPv6 solved the "HTTP 400 Bad Request" error. To do this, type "about:config" in the address bar, search for "network.dns.disableIPv6", and set the value to "true".