hello, per default firefox doesn't have such an option in the right-click menu, so it was probably an extension like adblock plus which offered this kind of functionality. you'd have to go to firefox > addons > extensions & change the settings of the addon in questíon accordingly...

Hey thanks a lot ! the website is up & running again ! worked through the add-on.. just had to go there & remove it from the block sites list .. Cheers & appreciate your help.