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When I try to sign in to my Yahoo account, it says username or password is invalid. It is the right one and I can sign in on other browsers. What's up?

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For the past 4 days, every time I try to sign into my yahoo mail on firefox, it says my password or username are invalid. I can sign in with no problems on other browsers such as IE or Chrome. I even went so far as to have my password reset and it still doesn't work.

For the past 4 days, every time I try to sign into my yahoo mail on firefox, it says my password or username are invalid. I can sign in with no problems on other browsers such as IE or Chrome. I even went so far as to have my password reset and it still doesn't work.

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That issue can be caused by corrupted cookies.

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

"Clear the Cache":

  • Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox > Preferences > Privacy > Cookies: "Show Cookies"

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

Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete cookies.sqlite-journal and cookies.txt, if they exist, in the Firefox Profile Folder in case the file cookies.sqlite got corrupted.