There is a browser setting for "autofill" passwords and forms...
In chrome:
Turn off Autofill
Open Chrome.
At the top right, click More Settings.
At the bottom, click Advanced.
Under "Passwords and forms," turn off Autofill settings.
If you want to just delete specific autofill entries:
Click the Chrome menu on the browser toolbar and select Settings.
Click “Show advanced settings” and find the “Passwords and forms” section.
Select Manage Autofill settings.
In the dialog that appears, select the entry you'd like to delete from the list.
in Firefox:
Clearing form history
If you want Firefox to forget all of your previous form entries:
Click on the menu button New Fx Menu .
Click History, and then Clear Recent History….
In the Time Range to clear: drop-down, choose Everything.
Click on the arrow next to Details to display the list of items that you can clear.
Make sure Form & Search History has a check mark next to it.
Click Clear Now to clear your form history and close the dialog box.
Prevent Firefox from storing form entries
If you don't want Firefox to remember what you've entered into form fields, you can turn off the auto form fill feature:
Click the menu button New Fx Menu and choose Options.
Select the Privacy & Security panel.
In the drop-down menu next to Firefox will:, choose Use custom settings for history.
Remove the check mark next to Remember search and form history.
Close the about:preferences page. Any changes you've made will automatically be saved.
Disabling form history also prevents Firefox from storing search history for the Search bar in the Navigation Toolbar.
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