cannot activate javascript after trying all fixes listed for version 25

After auto upgrade from ver 24 to ver 25, javascript stopped working in firefox and will not enable. Have tried every fix I could find in the forum plus deleting java and reloading it, removing all plugins except java, cleaning registry of all references to firefox and reloading it and several others. None work. My Internet Explorer and Chrome work fine on all sites and gmail where firefox will not. Any more suggestions. Thanks in advance. I running Windows Ultimate on AMD dual core with 4Gb memory. Worked fine with firefox version 24 prior to update.

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