There are entities referred to as "pods" that operate using Chrome extensions.
If your post gets a high level of engagement in the first hour or so, it is likely that it will get a significant extra boost from LinkedIn's algorithm. A pod is a group of LinkedIn members who have agreed to systematically engage with each other's posts in a timely manner to create more visibility
www.linkedin.com
I stoped from attempting it because I was unwilling to jeopardize my profile's security by relying on a browser extension, even though it is a popular method.