2020-01-02 UTC
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[tantek] dmcweeney, try this tutorial: https://developer.mozilla.org/en-US/docs/Tools/Page_Inspector/How_to/Open_the_Inspector - there are many other online resources for how to use the Firefox Inspector as well. Since it doesn't sound like this is particularly indieweb specific/related, perhaps follow-up in the indieweb-chat channel for additional questions.