Chrome prevent computer from sleep on Windows 8

1). Open Command Prompt as Administrator and run the following command:

C:\Windows\system32>powercfg /requests
DISPLAY:
None.
SYSTEM:
[DRIVER] Cirrus Logic CS4206B (AB 28) (HDAUDIO\FUNC_01&VEN_1013&DEV_4206&SUBSYS_
106B1C00&REV_1003\4&6062198&0&0001)
An audio stream is currently in use.
AWAYMODE:
None.
EXECUTION:
[PROCESS] \Device\HarddiskVolume3\Program Files (x86)\Google\Chrome\Application\
chrome.exe
WebRTC has active PeerConnections
PERFBOOST:
None.

2). Override Chrome Power Request

powercfg /requestsoverride PROCESS chrome.exe AWAYMODE DISPLAY SYSTEM

To remove the override for Chrome,

powercfg /requestsoverride PROCESS chrome.exe

To check the current list of power request overrides,

powercfg /requestsoverride

Reference

https://techjourney.net/chrome-prevents-windows-from-going-into-sleep-standby-or-hibernation-mode/

Useful browser's add-ons/extensions

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Can't play video on browsers that requires Java plugin

I'm using Macbook Pro late 2011 with Mac OS X Mountain Lion v10.8. I like to watch movie online. Some sites require Java (Applet) plugin to play movies and I couldn't play them.

Below is the steps I solved it:
1). Download and install latest version of Java then restart your browser if it's running.
2). Enable Java applet plugin in your browser. Note that Chrome version 45 no longer supports NPAPI (technology required for Java applet) due to security risk so you cannot play videos on the sites that require Java applet on Chrome anymore. They might use HTML 5 instead to play videos. However, Firefox still support NPAPI so you might consider using it instead. You can enable the plugin by clicking Tools then Add-ons.

3). Add the site to Exception Site List in Java Control Panel. I installed Java 8 and it no longer has Medium security level. There are only Very High and High security levels so Java might block the site by default from using the plugin. Hence, you need to add the site to the exception list. You can go to System Preferences then Java.

4). Open the site or refresh the page and you'll get a popup at the top of the page asking you to allow the browser to run Java plugin for this site. You'll be asked to decide whether to allow it only this time or allow it forever.

5). Refresh the page again. After the page has loaded, it might takes several seconds before the dialog box below shows up.

Check the checkbox then click Run and your video will start playing.





References:
https://java.com/en/download/faq/chrome.xml

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