yes you can do that, just follow this instruction from the following post:

http://www.webune.com/forums/show-me-how-to-enable-javascript-in-firefox-browser-t43.html

To change the javascript options in Firefox you have to go to the properties. depending on what OS you have:

For Windows:
Go to Tool > Options >
Then Click on the "Content" section and check/uncheck "Enable Javascript"

well at this stage i am still waiting for results? i am quite happy to comment on it once i see it working its very hard to comment on something you have not seen the results of thank you

please help me.
i have some how disabled javascript in my firefox browser and now i am unable to watch youtube videos.how do i enable my javascript?
please help if u know the answer>
thx in advance.

show me how to browes free in opra min brower

the article was really helpful, but would be more beneficial, if the procedure followed for detecting if javascript is enabled or not is shown in details.

how do i enable javascript in my firefox browser