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diff -up firefox-91.0/toolkit/components/extensions/schemas/runtime.json.mozilla-bmo1554971 firefox-91.0/toolkit/components/extensions/schemas/runtime.json
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--- firefox-91.0/toolkit/components/extensions/schemas/runtime.json.mozilla-bmo1554971	2021-07-29 17:20:08.523253193 +0200
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+++ firefox-91.0/toolkit/components/extensions/schemas/runtime.json	2021-07-29 17:21:23.517498581 +0200
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@@ -64,7 +64,7 @@
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       {
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         "id": "PlatformArch",
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         "type": "string",
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-        "enum": ["aarch64", "arm", "ppc64", "s390x", "sparc64", "x86-32", "x86-64"],
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+        "enum": ["aarch64", "arm", "ppc64", "ppc64le", "s390x", "sparc64", "x86-32", "x86-64"],
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         "allowedContexts": ["content", "devtools"],
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         "description": "The machine's processor architecture."
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       },