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"Firefox Nightly Doge" refers to a nostalgic, fan-made theme or icon featuring the popular Doge meme (Shiba Inu) that users sometimes add to the early testing version of Firefox, known as Firefox Nightly, to customize its look, though Mozilla's current branding focuses on a new mascot, Kit, with Doge appearing in past experiments like a temporary icon in 2017. It's a community way to personalize the unstable, daily-updated browser for testing new features.