diff --git a/apps/desktop/src/preview/BrowserImport/Sources.test.ts b/apps/desktop/src/preview/BrowserImport/Sources.test.ts
index d0444d42e5021..898d94221b8d4 100644
--- a/apps/desktop/src/preview/BrowserImport/Sources.test.ts
+++ b/apps/desktop/src/preview/BrowserImport/Sources.test.ts
@@ -318,6 +318,237 @@ describe("cookieDatabaseCandidatePaths", () => {
 
 const firefox = BROWSER_IMPORT_SOURCES.find((source) => source.id === "firefox")!;
 
+const zen = BROWSER_IMPORT_SOURCES.find((source) => source.id === "zen")!;
+
+describe("Zen", () => {
+  it.effect("resolves Zen's native user-data roots on every supported platform", () =>
+    run(
+      Effect.gen(function* () {
+        const darwinContext = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, { HOME: "/Users/zen-user" }),
+          Effect.provideService(HostProcess.Platform, "darwin"),
+        );
+        const windowsContext = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, {
+            HOME: "C:\\Users\\zen-user",
+            APPDATA: "C:\\Users\\zen-user\\AppData\\Roaming",
+          }),
+          Effect.provideService(HostProcess.Platform, "win32"),
+        );
+        const linuxContext = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, { HOME: "/home/zen-user" }),
+          Effect.provideService(HostProcess.Platform, "linux"),
+        );
+
+        assert.equal(zen.name, "Zen");
+        assert.equal(zen.engine, "firefox");
+        assert.deepEqual([...zen.platforms], ["darwin", "win32", "linux"]);
+        assert.equal(
+          zen.userDataDirectory(darwinContext),
+          darwinContext.path.join("/Users/zen-user", "Library", "Application Support", "zen"),
+        );
+        assert.equal(
+          zen.userDataDirectory(windowsContext),
+          windowsContext.path.join("C:\\Users\\zen-user\\AppData\\Roaming", "zen"),
+        );
+        assert.equal(
+          zen.userDataDirectory(linuxContext),
+          linuxContext.path.join("/home/zen-user", ".config", "zen"),
+        );
+        assert.deepEqual(zen.alternateLinuxRoots?.(linuxContext), [
+          linuxContext.path.join("/home/zen-user", ".zen"),
+          linuxContext.path.join("/home/zen-user", ".var", "app", "app.zen_browser.zen", "zen"),
+        ]);
+      }),
+    ),
+  );
+
+  it.effect("discovers Zen profiles through its Firefox-compatible metadata", () =>
+    run(
+      Effect.gen(function* () {
+        const fileSystem = yield* FileSystem.FileSystem;
+        const home = yield* fileSystem.makeTempDirectoryScoped({ prefix: "t3code-zen-" });
+        const context = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, { HOME: home }),
+          Effect.provideService(HostProcess.Platform, "darwin"),
+        );
+        const root = zen.userDataDirectory(context)!;
+        yield* fileSystem.makeDirectory(root, { recursive: true });
+        const profile = context.path.join(root, "Profiles", "zen.default");
+        yield* fileSystem.makeDirectory(profile, { recursive: true });
+        yield* writeFirefoxCookieDatabase(context.path.join(profile, "cookies.sqlite"), 2, 1);
+        yield* fileSystem.makeDirectory(context.path.join(root, "Profiles", "empty.default"), {
+          recursive: true,
+        });
+        yield* fileSystem.writeFileString(
+          context.path.join(root, "profiles.ini"),
+          [
+            "[Profile0]",
+            "Name=Zen",
+            "IsRelative=1",
+            "Path=Profiles/zen.default",
+            "ZenAvatarPath=chrome://browser/content/zen-avatars/avatar-55.svg",
+            "Default=1",
+            "",
+            "[Profile1]",
+            "Name=Empty",
+            "IsRelative=1",
+            "Path=Profiles/empty.default",
+            "",
+          ].join("\n"),
+        );
+
+        assert.deepEqual(yield* listSourceProfiles(zen, context), [
+          {
+            directory: context.path.join("Profiles", "zen.default"),
+            name: "Zen",
+            cookieCount: 2,
+          },
+        ]);
+        assert.isTrue(yield* isSourceInstalled(zen, context));
+        assert.isFalse(yield* isSourceRunning(zen, context));
+        assert.equal(
+          yield* resolveCookieDatabase(zen, context, context.path.join("Profiles", "zen.default")),
+          context.path.join(profile, "cookies.sqlite"),
+        );
+      }),
+    ),
+  );
+
+  it.effect("discovers Zen profiles in both current and legacy Linux roots", () =>
+    run(
+      Effect.gen(function* () {
+        const fileSystem = yield* FileSystem.FileSystem;
+        const home = yield* fileSystem.makeTempDirectoryScoped({ prefix: "t3code-zen-linux-" });
+        const context = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, { HOME: home }),
+          Effect.provideService(HostProcess.Platform, "linux"),
+        );
+        const currentRoot = context.path.join(home, ".config", "zen");
+        const legacyRoot = context.path.join(home, ".zen");
+        const currentProfile = context.path.join(currentRoot, "current.default");
+        const legacyProfile = context.path.join(legacyRoot, "legacy.default");
+
+        for (const [root, profile, name] of [
+          [currentRoot, currentProfile, "Current"],
+          [legacyRoot, legacyProfile, "Legacy"],
+        ] as const) {
+          yield* fileSystem.makeDirectory(profile, { recursive: true });
+          yield* writeFirefoxCookieDatabase(context.path.join(profile, "cookies.sqlite"), 1, 0);
+          yield* fileSystem.writeFileString(
+            context.path.join(root, "profiles.ini"),
+            [
+              "[Profile0]",
+              `Name=${name}`,
+              "IsRelative=1",
+              `Path=${context.path.basename(profile)}`,
+            ].join("\n"),
+          );
+        }
+
+        assert.deepEqual(yield* listSourceProfiles(zen, context), [
+          { directory: "current.default", name: "Current", cookieCount: 1 },
+          { directory: legacyProfile, name: "Legacy", cookieCount: 1 },
+        ]);
+        assert.isTrue(yield* isSourceInstalled(zen, context));
+        assert.equal(
+          yield* resolveCookieDatabase(zen, context, legacyProfile),
+          context.path.join(legacyProfile, "cookies.sqlite"),
+        );
+
+        yield* fileSystem.writeFileString(
+          context.path.join(currentRoot, "profiles.ini"),
+          `[Profile0]\nName=Shared\nIsRelative=0\nPath=${legacyProfile}\n`,
+        );
+        assert.deepEqual(yield* listSourceProfiles(zen, context), [
+          { directory: legacyProfile, name: "Shared", cookieCount: 1 },
+        ]);
+
+        yield* fileSystem.remove(currentRoot, { recursive: true });
+        assert.isTrue(yield* isSourceInstalled(zen, context));
+        assert.deepEqual(yield* listSourceProfiles(zen, context), [
+          { directory: legacyProfile, name: "Legacy", cookieCount: 1 },
+        ]);
+      }),
+    ),
+  );
+
+  it.effect("discovers a Flatpak-only Zen installation and resolves its cookies", () =>
+    run(
+      Effect.gen(function* () {
+        const fileSystem = yield* FileSystem.FileSystem;
+        const home = yield* fileSystem.makeTempDirectoryScoped({ prefix: "t3code-zen-flatpak-" });
+        const context = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, { HOME: home }),
+          Effect.provideService(HostProcess.Platform, "linux"),
+        );
+        const root = context.path.join(home, ".var", "app", "app.zen_browser.zen", "zen");
+        const profile = context.path.join(root, "flatpak.default");
+        yield* fileSystem.makeDirectory(profile, { recursive: true });
+        yield* writeFirefoxCookieDatabase(context.path.join(profile, "cookies.sqlite"), 2, 1);
+        yield* fileSystem.writeFileString(
+          context.path.join(root, "profiles.ini"),
+          "[Profile0]\nName=Flatpak\nIsRelative=1\nPath=flatpak.default\n",
+        );
+
+        assert.deepEqual(yield* listSourceProfiles(zen, context), [
+          { directory: profile, name: "Flatpak", cookieCount: 2 },
+        ]);
+        assert.isTrue(yield* isSourceInstalled(zen, context));
+        assert.equal(
+          yield* resolveCookieDatabase(zen, context, profile),
+          context.path.join(profile, "cookies.sqlite"),
+        );
+      }),
+    ),
+  );
+
+  it.effect("does not mistake Firefox Snap installs for Zen profiles", () =>
+    run(
+      Effect.gen(function* () {
+        const fileSystem = yield* FileSystem.FileSystem;
+        const home = yield* fileSystem.makeTempDirectoryScoped({ prefix: "t3code-zen-snap-" });
+        const context = yield* sourcePathContext.pipe(
+          Effect.provideService(HostProcess.Environment, { HOME: home }),
+          Effect.provideService(HostProcess.Platform, "linux"),
+        );
+        const zenRoot = context.path.join(home, ".config", "zen");
+        const snapRoot = context.path.join(
+          home,
+          "snap",
+          "firefox",
+          "common",
+          ".mozilla",
+          "firefox",
+        );
+        const zenProfile = context.path.join(zenRoot, "zen.default");
+        const snapProfile = context.path.join(snapRoot, "snap.default");
+        for (const root of [zenRoot, snapRoot]) {
+          const profile = root === zenRoot ? zenProfile : snapProfile;
+          yield* fileSystem.makeDirectory(profile, { recursive: true });
+          yield* writeFirefoxCookieDatabase(context.path.join(profile, "cookies.sqlite"), 1, 0);
+          yield* fileSystem.writeFileString(
+            context.path.join(root, "profiles.ini"),
+            [
+              "[Profile0]",
+              "Name=Personal",
+              "IsRelative=1",
+              `Path=${profile === zenProfile ? "zen.default" : "snap.default"}`,
+            ].join("\n"),
+          );
+        }
+
+        const profiles = yield* listSourceProfiles(zen, context);
+        assert.deepEqual(
+          profiles.map((profile) => profile.directory),
+          ["zen.default"],
+        );
+        assert.isTrue(yield* isSourceInstalled(zen, context));
+      }),
+    ),
+  );
+});
+
 describe("Firefox Snap profiles", () => {
   it.effect.skipIf(!symlinksSupported)(
     "finds Snap profiles with or without profiles.ini and checks their locks",
diff --git a/apps/desktop/src/preview/BrowserImport/Sources.ts b/apps/desktop/src/preview/BrowserImport/Sources.ts
index 0bf3df235f946..14c4bca77b7e6 100644
--- a/apps/desktop/src/preview/BrowserImport/Sources.ts
+++ b/apps/desktop/src/preview/BrowserImport/Sources.ts
@@ -26,6 +26,7 @@ export interface BrowserImportSourceDefinition {
   readonly engine: BrowserImportEngine;
   readonly platforms: ReadonlyArray<NodeJS.Platform>;
   readonly userDataDirectory: (context: BrowserImportPathContext) => string | undefined;
+  readonly alternateLinuxRoots?: (context: BrowserImportPathContext) => ReadonlyArray<string>;
   readonly keychainService?: string;
   readonly keychainAccount?: string;
   readonly linuxSecretApplication?: string;
@@ -169,6 +170,26 @@ export const BROWSER_IMPORT_SOURCES: ReadonlyArray<BrowserImportSourceDefinition
       }
       return context.path.join(context.home, ".mozilla", "firefox");
     },
+    alternateLinuxRoots: (context) => [
+      context.path.join(context.home, "snap", "firefox", "common", ".mozilla", "firefox"),
+    ],
+  },
+  {
+    id: "zen",
+    name: "Zen",
+    engine: "firefox",
+    platforms: ["darwin", "win32", "linux"],
+    userDataDirectory: (context) => {
+      if (context.platform === "darwin") return macApplicationSupport(context, "zen");
+      if (context.platform === "win32") {
+        return context.appData ? context.path.join(context.appData, "zen") : undefined;
+      }
+      return context.path.join(context.home, ".config", "zen");
+    },
+    alternateLinuxRoots: (context) => [
+      context.path.join(context.home, ".zen"),
+      context.path.join(context.home, ".var", "app", "app.zen_browser.zen", "zen"),
+    ],
   },
 ];
 
@@ -470,7 +491,7 @@ const listSourceProfilesInDirectory = Effect.fnUntraced(function* (
   );
 });
 
-/** Keep Snap profile paths absolute so reads and locks distinguish native and Snap installations. */
+/** Keep alternate-root profile paths absolute so cookie reads and locks use the correct installation. */
 export const listSourceProfiles = Effect.fn("BrowserImportSources.listSourceProfiles")(function* (
   definition: BrowserImportSourceDefinition,
   context: BrowserImportPathContext,
@@ -481,10 +502,7 @@ export const listSourceProfiles = Effect.fn("BrowserImportSources.listSourceProf
 
   const root = definition.userDataDirectory(context);
   if (root === undefined) return [];
-  const roots = [
-    root,
-    context.path.join(context.home, "snap", "firefox", "common", ".mozilla", "firefox"),
-  ];
+  const roots = [root, ...(definition.alternateLinuxRoots?.(context) ?? [])];
   const profiles = new Map<string, BrowserImportSourceProfile>();
   for (const directory of roots) {
     const found = yield* listSourceProfilesInDirectory(
diff --git a/docs/user/browser-import.md b/docs/user/browser-import.md
index 36581c2c7ed27..ab1465e00bfda 100644
--- a/docs/user/browser-import.md
+++ b/docs/user/browser-import.md
@@ -15,6 +15,6 @@ System Settings permission list, and turn access on. **Continue** becomes availa
 is detected. macOS may require you to quit and reopen T3 Code before the grant applies; reopen
 the import wizard afterward. You can revoke Full Disk Access once the import is done.
 
-On Windows, import supports Firefox and Helium profiles that use standard profile encryption.
+On Windows, import supports Firefox, Zen, and Helium profiles that use standard profile encryption.
 Other Chromium-based browsers use app-bound encryption and cannot be imported. Partitioned cookies
 are skipped on all platforms.
diff --git a/packages/contracts/src/browserImport.ts b/packages/contracts/src/browserImport.ts
index 773d38cf6466b..f7f0f65e00e13 100644
--- a/packages/contracts/src/browserImport.ts
+++ b/packages/contracts/src/browserImport.ts
@@ -11,6 +11,7 @@ const BROWSER_IMPORT_SOURCE_IDS = [
   "arc",
   "helium",
   "firefox",
+  "zen",
   "safari",
 ] as const;