What website is this?

Did you clear the cookies as well, because this error is most of the time caused by corrupted cookies?

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

Hotmail among others

Please try the suggestion mentioned by cor-el.

I have done that several times and it does not help

Please read the following for help:

http://pcsupport.about.com/od/findbyerrormessage/a/400error.htm
http://blogs.msdn.com/b/webtopics/archive/2009/01/29/how-to-troubleshoot-http-400-errors.aspx
http://support.microsoft.com/kb/944141
http://www.checkupdown.com/status/E400.html

DISCLAIMER: The above-mentioned URLS will take you to a non-Mozilla Web site. Mozilla does not control it and is not responsible for information outside of Mozilla web sites.

Are you navigating to those pages via the main (home) page of that website or are you using a bookmark?

In case of the latter, this bookmark may no longer be working and you need to navigate via the main site to reach this page.

After the bookmarks did not work I tried typing the addy but got the same result. Googling and trying to connect via the link does not work either.

Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

Also have this problem.... Page opens in Chrome and Internet Explorer. Have cleared cookies, cache and history.... Tried Restore...Re-installed Firefox(didn't uninstall). Tried reset... Bad Request

Your browser sent a request that this server could not understand.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. Apache Server at bowltheshootout.com Port 80

This can be caused by corrupted cookies.

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

If clearing cookies doesn't work then it is possible that the cookies.sqlite file that stores the cookies is corrupted.

Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.

• http://kb.mozillazine.org/Cookies
• https://support.mozilla.org/kb/Deleting+cookies

This keeps happening to me also, usually when I click a link from a known email. I then go through the steps mentioned above, but eventually have to delete all cookies. The things work fine ... until the next time! Any suggestions?