diff --git a/apps/gittensory-miner-extension/README.md b/apps/gittensory-miner-extension/README.md
index 06dd6cf02a..15b0bb46d2 100644
--- a/apps/gittensory-miner-extension/README.md
+++ b/apps/gittensory-miner-extension/README.md
@@ -18,6 +18,5 @@ available for the current issue.
 ## Local ranked cache
 
 Laptop-mode installs can paste JSON from a miner `discover` run into the options page. The extension stores that list in
-`chrome.storage.local.rankedCandidates` and looks up the current issue there. A discovery-index URL can be saved for a
-future hosted client path; it is not read yet, so when only unranked hosted metadata would be available the badge
-degrades gracefully by staying hidden.
+`chrome.storage.local.rankedCandidates` and looks up the current issue there. When no ranked signal is cached for the
+current issue, the badge degrades gracefully by staying hidden.
diff --git a/apps/gittensory-miner-extension/background.js b/apps/gittensory-miner-extension/background.js
index bebc7cb081..d8c5b332a0 100644
--- a/apps/gittensory-miner-extension/background.js
+++ b/apps/gittensory-miner-extension/background.js
@@ -59,13 +59,11 @@ async function loadIssueOpportunityContext(message) {
 }
 
 async function loadMinerExtensionSettings() {
-  const stored = await chrome.storage.sync.get({ watchedRepos: [], discoveryIndexUrl: "" });
+  const stored = await chrome.storage.sync.get({ watchedRepos: [] });
   const watchedRepos = Array.isArray(stored.watchedRepos)
     ? stored.watchedRepos.map((value) => String(value).trim()).filter(Boolean)
     : [];
-  const discoveryIndexUrl =
-    typeof stored.discoveryIndexUrl === "string" ? stored.discoveryIndexUrl.trim() : "";
-  return { watchedRepos, discoveryIndexUrl };
+  return { watchedRepos };
 }
 
 async function loadRankedCandidates() {
diff --git a/apps/gittensory-miner-extension/options.html b/apps/gittensory-miner-extension/options.html
index 0bf82ea7af..be2bb3f3b1 100644
--- a/apps/gittensory-miner-extension/options.html
+++ b/apps/gittensory-miner-extension/options.html
@@ -64,10 +64,6 @@ <h1>Gittensory miner extension</h1>
           Watched repositories
           <textarea id="watchedRepos" name="watchedRepos" placeholder="owner/repo, one per line"></textarea>
         </label>
-        <label>
-          Discovery index URL (optional)
-          <input id="discoveryIndexUrl" name="discoveryIndexUrl" placeholder="https://example.com/discovery-index" />
-        </label>
         <label>
           Ranked candidates JSON (local cache)
           <textarea
diff --git a/apps/gittensory-miner-extension/options.js b/apps/gittensory-miner-extension/options.js
index 316858c654..6e2c5062ed 100644
--- a/apps/gittensory-miner-extension/options.js
+++ b/apps/gittensory-miner-extension/options.js
@@ -25,10 +25,9 @@ if (globalThis.__GITTENSORY_MINER_EXTENSION_TEST__) {
 const form = document.querySelector("#settings");
 const status = document.querySelector("#status");
 const watchedRepos = document.querySelector("#watchedRepos");
-const discoveryIndexUrl = document.querySelector("#discoveryIndexUrl");
 const rankedCandidatesJson = document.querySelector("#rankedCandidatesJson");
 
-if (!form || !status || !watchedRepos || !discoveryIndexUrl || !rankedCandidatesJson) {
+if (!form || !status || !watchedRepos || !rankedCandidatesJson) {
   // options.html is not mounted (unit-test harness or partial load).
 } else {
 void refreshSettings();
@@ -38,10 +37,7 @@ form.addEventListener("submit", async (event) => {
   try {
     const repos = parseWatchedRepos(watchedRepos.value);
     const rankedCandidates = parseRankedCandidatesJson(rankedCandidatesJson.value);
-    await chrome.storage.sync.set({
-      watchedRepos: repos,
-      discoveryIndexUrl: discoveryIndexUrl.value.trim(),
-    });
+    await chrome.storage.sync.set({ watchedRepos: repos });
     await chrome.storage.local.set({ rankedCandidates });
     await refreshSettings();
     showStatus(
@@ -56,11 +52,10 @@ form.addEventListener("submit", async (event) => {
 }
 
 async function refreshSettings() {
-  const stored = await chrome.storage.sync.get({ watchedRepos: [], discoveryIndexUrl: "" });
+  const stored = await chrome.storage.sync.get({ watchedRepos: [] });
   const local = await chrome.storage.local.get({ rankedCandidates: [] });
   const repos = Array.isArray(stored.watchedRepos) ? stored.watchedRepos : [];
   watchedRepos.value = repos.join("\n");
-  discoveryIndexUrl.value = typeof stored.discoveryIndexUrl === "string" ? stored.discoveryIndexUrl : "";
   const rankedCandidates = Array.isArray(local.rankedCandidates) ? local.rankedCandidates : [];
   rankedCandidatesJson.value =
     rankedCandidates.length > 0 ? JSON.stringify(rankedCandidates, null, 2) : "";
diff --git a/test/unit/miner-extension-content.test.ts b/test/unit/miner-extension-content.test.ts
index c4d0871138..376ba101d0 100644
--- a/test/unit/miner-extension-content.test.ts
+++ b/test/unit/miner-extension-content.test.ts
@@ -7,6 +7,7 @@ const contentScript = readFileSync("apps/gittensory-miner-extension/content.js",
 const backgroundScript = readFileSync("apps/gittensory-miner-extension/background.js", "utf8");
 const badgeScript = readFileSync("apps/gittensory-miner-extension/opportunity-badge.js", "utf8");
 const optionsScript = readFileSync("apps/gittensory-miner-extension/options.js", "utf8");
+const optionsHtml = readFileSync("apps/gittensory-miner-extension/options.html", "utf8");
 const manifest = JSON.parse(readFileSync("apps/gittensory-miner-extension/manifest.json", "utf8"));
 
 const NOW = Date.parse("2026-07-03T12:00:00.000Z");
@@ -146,8 +147,64 @@ describe("miner extension opportunity badge", () => {
     expect(() => internals.parseRankedCandidatesJson("{")).toThrow();
     expect(() => internals.parseRankedCandidatesJson('{"not":"array"}')).toThrow();
   });
+
+  it("REGRESSION (dead-field removal): no discoveryIndexUrl config field remains anywhere in the extension", () => {
+    expect(optionsHtml).not.toMatch(/discoveryIndexUrl/);
+    expect(optionsScript).not.toMatch(/discoveryIndexUrl/);
+    expect(backgroundScript).not.toMatch(/discoveryIndexUrl/);
+  });
+
+  it("saves and restores settings without ever writing or reading discoveryIndexUrl", async () => {
+    const synced: Record<string, unknown> = { watchedRepos: [] };
+    const setCalls: Array<Record<string, unknown>> = [];
+    const elements = {
+      "#settings": createFormMock(),
+      "#status": { textContent: "" },
+      "#watchedRepos": { value: "" },
+      "#rankedCandidatesJson": { value: "" },
+    };
+    const context: Record<string, unknown> = {
+      __GITTENSORY_MINER_EXTENSION_TEST__: true,
+      document: { querySelector: (selector: string) => elements[selector as keyof typeof elements] ?? null },
+      chrome: {
+        storage: {
+          sync: {
+            get: async (defaults: Record<string, unknown>) => ({ ...defaults, ...synced }),
+            set: async (value: Record<string, unknown>) => {
+              setCalls.push(value);
+              Object.assign(synced, value);
+            },
+          },
+          local: { get: async () => ({ rankedCandidates: [] }), set: async () => {} },
+        },
+      },
+      window: { setTimeout: () => 0 },
+    };
+    context.globalThis = context;
+    const vmContext = createContext(context);
+    new Script(optionsScript).runInContext(vmContext);
+
+    elements["#watchedRepos"].value = "JSONbored/gittensory";
+    await elements["#settings"].dispatchSubmit();
+
+    expect(setCalls).toHaveLength(1);
+    expect(setCalls[0]).toEqual({ watchedRepos: ["JSONbored/gittensory"] });
+    expect("discoveryIndexUrl" in synced).toBe(false);
+  });
 });
 
+function createFormMock() {
+  let submitHandler: ((event: { preventDefault: () => void }) => unknown) | null = null;
+  return {
+    addEventListener: (type: string, handler: typeof submitHandler) => {
+      if (type === "submit") submitHandler = handler;
+    },
+    dispatchSubmit: async () => {
+      await submitHandler?.({ preventDefault: () => {} });
+    },
+  };
+}
+
 function createMockContainer() {
   const container = {
     hidden: false,
@@ -207,7 +264,7 @@ function loadBackgroundInternals({
     chrome: {
       storage: {
         sync: {
-          get: async () => ({ watchedRepos, discoveryIndexUrl: "" }),
+          get: async () => ({ watchedRepos }),
         },
         local: {
           get: async () => ({ rankedCandidates }),
@@ -239,7 +296,7 @@ function loadOptionsInternals() {
     document: { querySelector: () => null },
     chrome: {
       storage: {
-        sync: { get: async () => ({ watchedRepos: [], discoveryIndexUrl: "" }), set: async () => {} },
+        sync: { get: async () => ({ watchedRepos: [] }), set: async () => {} },
         local: { get: async () => ({ rankedCandidates: [] }), set: async () => {} },
       },
     },