Play utube without flash

•  Firstly, download portable Firefox from portableapps’ website. Run the file and follow instructions on screen. Check if you can run the portable Firefox before proceeding to the next step.
• Download Flash Player .xpi version from Macromedia => Link
• Change the file extension from .xpi to .zip by renaming it as flashplayer-win.zip
• Since you now have it as a .zip archive, extract the files in the archive to a folder.
• Copy the files flashplayer.xpt and NPSWF32.dll to the plugin folder inside your Portable Firefox folder:

FirefoxPortable\App\Firefox\plugins

Run the now flash-embedded Portable Firefox. You can view flash file anywhere you want on Windows-based PC without having to install anything as long as you have the portable Firefox with you.
The method of embedding flash player above can also be applied to the standard version of Firefox.