The code provided below is present in an html file. When opening the file in Firefox there is a black box being shown instead of the video. Does this mean an addon, extension, or application needs updating or a setting in Firefox needs changing?
<!DOCTYPE html>
<html>
<body>
<iframe width="420" height="345"
src="http://www.youtube.com/embed/XGSy3_Czz8k">
</iframe>
</body>
</html>
I made a mistake. This code actually worked, but I thought it didn’t work a few times even though it did. I actually tried using a different Youtube video, and it wasn’t working because I manually coded what src equaled incorrectly as opposed to just right-clicking the Youtube video and selecting “Copy embed html”. So the problem had nothing to do with browsers, addons, plugins, extensions, or updates. I just had incorrect code for src.
Note: Use the “Copy embed html” feature as opposed to manually trying to enter in the code.