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When I click a link to a self-hosted XPI file, Firefox no longer prompts to install it.

Dave

I'm not sure exactly when this behavior started, but I've noticed that when I click a link to an XPI file on a third-party web-site, Firefox no longer prompts to install the extension.

For instance, when I click the outlined link in the first screenshot, the second screenshot shows what happens.

I'm not sure exactly when this behavior started, but I've noticed that when I click a link to an XPI file on a third-party web-site, Firefox no longer prompts to install the extension. For instance, when I click the outlined link in the first screenshot, the second screenshot shows what happens.
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選擇的解決方法

The latest beta XPI file is send as type binary/octet-stream. Firefox always downloads such a file.

You will have to install the extension via the about:addons page or drag the file in a Firefox window to trigger installation.