Chrome Issue: We are having trouble playing this video.

I was using Chromium browser v37 on Mac OSX Lion v10.7 and I was able to play videos on any sites such as Youtube, Facebook, and so on. After I upgraded it to v44, I still could play videos on Youtube but not on Facebook and it showed the message below.

To fix the problems,
1). Type "chrome://flags/#enable-npapi" in browser's address bar
2). Find the item "Enable NPAPI Mac, Windows" and click on Enable link
3). Restart browser

References

https://www.facebook.com/help/community/question/?id=10202758465869794 - commented by Gary Miller.
https://www.java.com/en/download/faq/chrome.xml#npapichrome

Chrome Issue: Adobe Flash Player needs your permission to run

I was using Chromium browser version 37 on Mac OSX Lion v10.7. Then, I upgraded it to version 44. After the upgrade, I could play videos on Youtube but not on Facebook. It said: "Adobe Flash Player needs your permission to run" as in the below screenshot.

To solve this problem:
1). Type "chrome://plugins/" in the browser's address bar
2). Find the item "Adobe Flash Player - Version: xxx" and check "Always allowed to run" checkbox. Note that if we don't enable NPAPI, we might not see the item in the plugins list. To enable NPAPI, see http://myt8chnote.blogspot.com/2015/05/chrome-issue-we-are-having-trouble.html
3). Restart browser