Youtube Embedded Videos freeze Firefox

Hi everyone,
I noticed that on firefox when I go to pages that embeds YT videos my browser freeze and I have to forcely quit it.
With Standard GNOME3 web browser this doesn't happen. Can someone give an hint?
3.12.7-2-ARCH (64bit)
Firefox 26.0
flashplugin 11.2.202.332-1
Thanks to all of you in advance.

Thank you Wyodor, I also believe the solution may be simple, if it helps (and for all you coding experts out there) these are the three video/codes being used. For each code I had to add after " http: and before
//www.youtube to load videos to iWeb using html widget.
Video One code
This video on published website - plays using both Safari and Firefox.
<iframe width="1000" height="563" src="http://www.youtube.com/embed/rrMsYI6XVSw?rel=0" frameborder="0" allowfullscreen></iframe>
Video Two code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
Video Three code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
If anybody knows the solution to this problem I will be pleased to hear from them. I am not a coding expert!

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Thank you Wyodor, I also believe the solution may be simple, if it helps (and for all you coding experts out there) these are the three video/codes being used. For each code I had to add after " http: and before
//www.youtube to load videos to iWeb using html widget.
Video One code
This video on published website - plays using both Safari and Firefox.
<iframe width="1000" height="563" src="http://www.youtube.com/embed/rrMsYI6XVSw?rel=0" frameborder="0" allowfullscreen></iframe>
Video Two code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
Video Three code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
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Thank you Wyodor, I also believe the solution may be simple, if it helps (and for all you coding experts out there) these are the three video/codes being used. For each code I had to add after " http: and before
//www.youtube to load videos to iWeb using html widget.
Video One code
This video on published website - plays using both Safari and Firefox.
<iframe width="1000" height="563" src="http://www.youtube.com/embed/rrMsYI6XVSw?rel=0" frameborder="0" allowfullscreen></iframe>
Video Two code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
Video Three code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
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