How to download Chrome and Edge extensions in CRX v3 format

This post is probably going to become outdated pretty fast, so don't be surprised if a few months (or a year) after I wrote this, the method won't work.

For Chrome:
curl -v -o t.crx -L \
  "https://clients2.google.com/service/update2/crx?response=redirect&os=linux&arch=x64&os_arch=x86_64&nacl_arch=x86-64&prod=chromecrx&prodchannel=&prodversion=87.0.4280.88&lang=en-US&acceptformat=zip&x=id%3D${extensionID}%26installsource%3Dondemand%26uc"

For Edge (the Chromium based one):
curl -v -o t.crx -L \
  "https://edge.microsoft.com/extensionwebstorebase/v1/crx?response=redirect&os=linux&arch=x64&os_arch=x86_64&nacl_arch=x86-64&prod=chromiumcrx&prodchannel=dev&prodversion=89.0.731.0&lang=en-US&acceptformat=crx3&x=id%3D${extensionID}%26installsource%3Dondemand%26uc"

In both cases you've to specify the extension ID in the "extensionID" variable. And of course you can adjust the other URI parameters if you want to.

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