429 error

[Murf54]

i have reloaded and refreshed Firefox in the more trouble shoot i tried changing a profile and new password disabled all my adons and with all i have done every time i try to go to it in my Firefox browser i get the page and can type the problem but as soon as i hit submit it giv me a 429 error every time i have cleared cache but not cookies as ill have to put in my name and passwords to every thing a gain id not like to do that I even reinstalled Firefox.yet it works on chrome so s it firefox problem or is it me. I even went to Comcast to check my my internet nr et work and they said it was fine so what am i doing wrong