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I'm using Firefox on a desktop computer, but for some reason it's acting like a mobile browser and going to mobile sites. How do I disable this and have it default to desktop versions of sites?

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I'm using Firefox on a desktop computer, but for some reason it's acting like a mobile browser and going to mobile sites. How do I disable this and have it default to desktop versions of sites?

I'm using Firefox on a desktop computer, but for some reason it's acting like a mobile browser and going to mobile sites. How do I disable this and have it default to desktop versions of sites?

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).