Remove a site's cookies from Firefox
The following steps can be taken to remove the cookies associated with a
particular website in the Firefox browser. Note: these steps were taken on
Firefox 50.0.2 on a Microsoft Windows 10 system, but should be applicable to
other versions as well.
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Click on the 3 horizontal bars at the upper, right-hand corner of the Firefox
Window.
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Click on Options.
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In the about:preferences window, click on Privacy.
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Under the History setion of the Privacy window, click on
"remove individual cookies".
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In the Cookies window, scroll down to you find the relevant site.
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Click on the relevant site to select it, then click on the Remove Selected
button.