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A regression in Firefox 81 breaks Blackboard Learn. This userscript forces Learn to use a polyfill instead of the broken API.
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| // ==UserScript== | |
| // @name Ultra IntersectionObserver Fix | |
| // @version 1 | |
| // @grant none | |
| // @match https://*/ultra/* | |
| // @run-at document-start | |
| // ==/UserScript== | |
| delete unsafeWindow.IntersectionObserver; |
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The @match is very broad, so it'll work on all Learn instances that are running Ultra. It might inadvertently affect non-Learn pages, though.