diff --git a/amo-metadata.json b/amo-metadata.json
new file mode 100644
index 0000000..3ae12df
--- /dev/null
+++ b/amo-metadata.json
@@ -0,0 +1,6 @@
+{
+  "categories": ["tabs"],
+  "version": {
+    "license": "MIT"
+  }
+}
diff --git a/docs/publishing-firefox.md b/docs/publishing-firefox.md
index 4327f3c..3c72769 100644
--- a/docs/publishing-firefox.md
+++ b/docs/publishing-firefox.md
@@ -23,8 +23,14 @@ npm run lint:firefox     # sanity check — expect 0 errors
 npm run submit:firefox   # builds, packages, uploads to the LISTED channel
 ```
 
-`submit:firefox` runs `web-ext submit --channel=listed`, which uploads
-`dist-firefox/` and creates/updates the add-on under your AMO account.
+`submit:firefox` runs `web-ext sign --channel=listed`, which uploads
+`dist-firefox/` and creates/updates the add-on under your AMO account. It also
+passes `--amo-metadata=amo-metadata.json`, which supplies the per-version
+**license** (`{ "version": { "license": "MIT" } }`). Listed versions are rejected
+without one — the API returns `version.license: "This field, or custom_license, is
+required for listed versions."` `"MIT"` is one of AMO's built-in license slugs and
+matches `LICENSE.md`; use `version.custom_license` (an object) only for
+non-standard terms.
 
 ## What AMO will ask for / require
 
@@ -38,8 +44,9 @@ npm run submit:firefox   # builds, packages, uploads to the LISTED channel
   { required: ["none"] }`. The listing still needs a short privacy note saying
   exactly that. A hosted privacy policy URL may be requested.
 - **Listing metadata** (entered on the site, not in the repo): summary,
-  full description, at least one screenshot, category, support email/URL,
-  and a license (the repo has none yet — pick one, e.g. MIT).
+  full description, at least one screenshot, category, and support email/URL.
+  The license is MIT (`LICENSE.md`) and is sent automatically via
+  `amo-metadata.json` — see the submit step above.
 - **Review.** Minified/bundled add-ons get human review; expect a delay and
   possible follow-up questions referencing the source upload.
 
diff --git a/package.json b/package.json
index daec91f..3eeae54 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "history-graph",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Visualize your browsing history as a graph.",
   "private": true,
   "type": "module",
@@ -10,7 +10,7 @@
     "package": "npm run build && node scripts/package.mjs",
     "lint:firefox": "npm run package && web-ext lint --source-dir=dist-firefox",
     "sign:firefox": "npm run package && web-ext sign --source-dir=dist-firefox --artifacts-dir=release --channel=unlisted",
-    "submit:firefox": "npm run package && web-ext submit --source-dir=dist-firefox --channel=listed",
+    "submit:firefox": "npm run package && web-ext sign --source-dir=dist-firefox --artifacts-dir=release --channel=listed --amo-metadata=amo-metadata.json",
     "dev": "vite build --watch --mode development",
     "typecheck": "tsc --noEmit",
     "test": "tsx tests/logic.test.ts && tsx tests/graph.test.ts && tsx tests/navEntries.test.ts",