As written there, Firefox does not support WebUSB, so no. You cannot use Firefox to flash postmarketOS.
You can use any other flashing method though, command line, UBports installer and so.
Luca Weiss
npub164…7k0lj
2026-05-18 12:46:12 UTC
in reply to nevent1q…tz2e
Author Public Key
npub164g6r6ej2039umae73a9l9qcnfck884l3v8cnd322s8mvry8wnasq7k0ljSeen on
wss://relay.momostr.pinkPublished at
2026-05-18 12:46:12 UTCEvent JSON
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"pubkey": "d551a1eb3253e25e6fb9f47a5f94189a71639ebf8b0f89b62a540fb60c8774fb",
"created_at": 1779108372,
"kind": 1,
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"content": "As written there, Firefox does not support WebUSB, so no. You cannot use Firefox to flash postmarketOS.\n\nYou can use any other flashing method though, command line, UBports installer and so.",
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