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Broswer window width cannot be resized to go under 450px anymore.

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The newer versions of Firefox do not allow you to resize your browser window width to go under 450px. Is there any setting I can change this limitation?

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You need to override Firefox's default minimum width value with a minimum width of 0 pixels. This can be done by adding the following CSS code to a userChrome.css file:

:root {
    min-width: 0 !important;
}

If you do not already have a userChrome.css file setup or are unfamiliar with how to use userChrome.css modifications, please see How to Create a userChrome.css File.

Hope this helps.