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webextension-polyfill-ts reviews and mentions
It’s Like GPT-3 but for Code–Fun, Fast, and Full of Flaws
5 projects | news.ycombinator.com | 19 Mar 2022
I've written extensions before and Firefox has a very good polyfill  that makes it quite easy to write extensions for all browsers. It does get a bit trickier if you also want to incorporate TypeScript  or React however.
Lusito/webextension-polyfill-ts is an open source project licensed under zlib License which is an OSI approved license.
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