FF Apps Archive contains thousands of apps from the defunct Firefox Marketplace.
Packaged Apps - can be installed here
Privileged Apps - cannot be installed directly and must be sideloaded using developer tools
Hosted Apps - possibly installable, but might no longer function
Dead Hosted Apps - cannot be installed
Progressive Web Apps (PWAs) - can be installed in modern web browsers
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Games
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Books & Comics
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Business
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Education
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Entertainment
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Food & Drink
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Health & Fitness
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Humor
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Internet
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Kids
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Lifestyle
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Maps & Navigation
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Music
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News
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Personalization
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Photo & Video
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Productivity
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Reference
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Science & Tech
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Shopping
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Social
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Sports
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Travel
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Utilities
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Weather
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News & Weather
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Books
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Works Offline
Firefox apps can be installed on any version of Firefox OS and on old versions of the Firefox web browser until v46.
Firefox desktop v45
Firefox Android v45
Firefox OS 2.5 Android launcher
For instructions on sideloading privileged apps on Firefox OS, see Sideloading Instructions.
Credits:
Daniel Herr - Project Creator and Engineer
Dimitrios Vlachos - Community Manager