Skimming the list, looks like most extensions are for scraping or automating LinkedIn usage. Not surprising as there's money to be made with LinkedIn data. Scraping was a problem when I worked there, the abuse teams built some reasonably sophisticated detection & prevention, and it was a constant battle.
a problem for linkedin != "a problem". The real problem for people is the back room data brokering linkedin and others do.
from the code doesn't look like they do anything if they have a match, they just save all the results to a csv for fingerprinting?
Wont someone think of poor little LinkedIn, a subsidiary of one of the largest data brokers in the world?
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In order to create the data source that LinkedIn's extension-fingerprinting relies on to work, someone (at LinkedIn*?) almost certainly violated the Chrome Web Store TOS—by (perversely*) scraping it.
* if LinkedIn didn't get it from an existing data source