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site open very slowly

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Hi there my default browser is Firefox Mozilla but certain sites open very slowly or not open at all. All things I did were clean the cache, reinstalling Mozilla software but nothing works and its a bit frustrating. Also Adblock Plus wont work on you tube. Thank you in advance Kuba

'''Hi there my default browser is Firefox Mozilla but certain sites open very slowly or not open at all. All things I did were clean the cache, reinstalling Mozilla software but nothing works and its a bit frustrating. ''' Also Adblock Plus wont work on you tube. Thank you in advance Kuba

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Show us something. Hard to help with something you cannot see. What sites? What OS? If windows, home or pro? If windows, are you running any security software besides MS Defender? What version of Firefox?

See load time for Lexus in Japan. see screenshot Here is the add-on I use to see the load time. https://addons.mozilla.org/en-US/firefox/addon/load-time/