Firefox and HTTP HEAD Method

    Once upon a time, I had some kind of plugin in Firefox that allowed me to make HEAD requests.
    It looked like this: hold down shift, hover over the link and a small window with key information appears in front of your eyes. Most often I used this to determine the file size (well, they don’t always write the size).

    I tried now to find something similar, but I did not find anything ... Strange.

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