There are different tools for disabling the javascript. But i will introduce again my favorite and best web delveloper tool for you. This is one of best tool for hackers.
Download it and install in mozilla
Web Developer – Get this Extension for 
Firefox (en-US)
Download Web Developer for Firefox. The Web Developer extension adds various web developer tools to the browser.
addons.mozilla.org
you can see Disable button in toolbar section.
click the button
You can now see the “disable Javascript” option
Select it.
Again select “All Javascript” option.
That’s all your favorite website’s javascript is disabled.
You can now use right click.
Want to say thanks? instead of saying simply thanx. Just share this link in
stumblupon or delicious or reddit or any other public social bookmark sites. If you are doing so,I am thankful to you
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