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Firefox Login changes passwords when asked to save or update a password on some web pages

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When I Login to one of my Financial sites web page, that does NOT recommend Firefox because of this Login issue. My stored Login and Password work fine the first time I Login. I also get a message to Save the new password. If I save this Login update the last character of my Password is changed. One example I have tried with my normal account Name but a Password ending in "$" when the saved Password is viewed it has been changed to "%24" and the Login fails now as it should. I am not sure if this is a Firefox or web page problem? This ONE web page is the ONLY place I have run into any Login issues. Login seems to be the only place the web page doesn't work correctly. The web page fix is NOT to use Firefox but to use other browsers. I am using the latest Firefox version 87.0 with windows 7 but this has been an ongoing problem over several years.

When I Login to one of my Financial sites web page, that does NOT recommend Firefox because of this Login issue. My stored Login and Password work fine the first time I Login. I also get a message to Save the new password. If I save this Login update the last character of my Password is changed. One example I have tried with my normal account Name but a Password ending in "$" when the saved Password is viewed it has been changed to "%24" and the Login fails now as it should. I am not sure if this is a Firefox or web page problem? This ONE web page is the ONLY place I have run into any Login issues. Login seems to be the only place the web page doesn't work correctly. The web page fix is NOT to use Firefox but to use other browsers. I am using the latest Firefox version 87.0 with windows 7 but this has been an ongoing problem over several years.

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Some websites use JavaScript to modify the password field and possibly copy the password to another hidden field. If Firefox detects that the password has been modified the Firefox will offer to update the password. You can create a login block exception for this website (origin) with the proper protocol (usually https://) via Options/Preferences to prevent Firefox from updating the password. If necessary then you can edit the currently stored password on the Lockwise page.