Google still recommends you avoid using JavaScript for canonical tags but if you must, Google provided these recommendations.

Mozilla Firefox now also the ability to disable JavaScript in PDF documents should you wish to do so. This feature is merely a way for Mozilla to improve security in its web browser, and we like it.

For instance, the database reportedly contains 17,137 documents from Amazon, 6,405 from Apple, 137,285 from Citi, 32,153 from Google and 2,390 from Microsoft.