"HAR": ".har is a common filename extension denoting an HTTP Archive file. It is a JSON-formatted file that contain a trace of a Web browsers interaction with a given site." — Source: Wikipedia: .har
This tool allows you to find out what your blocker is NOT blocking. There are two panes, which allows you to easily compare two result sets – useful to compare two blockers, or same blocker with different settings, or a web page with and without a blocker, etc.
Important: be sure you factor out your browser cache by forcing a full reload of the page which you want to analyze. Usually a full reload can be forced by Shift-clicking on your browser's Reload button.
Note that HAR content can be quite large sometimes, and when pasting this content into a textarea, your browser may end up "seizing" -- this is not caused by the parser itself.
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| Hostnames | cookies sent | javascript | bandwidth | cookies sent | javascript | bandwidth |
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From gorhill/uBlock