feat: extend logic to Linkedin

[msramalho]

To do so, replicate the parsing logic implemented in https://ollie-boyd.github.io/Linkedin-post-timestamp-extractor/ and add the necessary changes to:

• manifest.json - new content script for tiktok
• linkedin.js parser file
• if relevant see also feat: extend the implemented logic parsers to work on archive.org #4
• update the README accordingly

any additional css/js changes.

Please include screenshots/example URLs in any PR.

[fspoettel]

I took a quick stab at this and was able to get it to work on individual posts.

It turned out to be harder than I expected on the home feed: The method outlined in the repo looks at post urn values. For the home feed, this value relates to the top-level activity (share, like, comment...), so the parsed timestamp does not relate to the original post for re-shares. As far as I can tell, the only way to get the original urn is by using the Copy link to post clipboard functionality, which calls an HTTP endpoint to retrieve the URL to the the post. I was not able to find the original urn in the DOM.

[msramalho]

Interesting, I had a similar challenge with tiktok where the "you may like" video thumbnails also had no urn available to extract the timestamp.

Do you think it's possible to silently make these HTTP requests to get Copy link button?