Find works in browsers.

tests/native_firefox.py

@@ -18,7 +18,10 @@ PAGE = Path(__file__).with_name("firefox-baseline.html")
 
 def run_inside():
     linked = os.environ.get("CTHULHU_FIREFOX_LINKED") == "1"
+    find = os.environ.get("CTHULHU_FIREFOX_FIND") == "1"
     page = Path(__file__).with_name("browser-linked-headings.html") if linked else PAGE
+    if find:
+        page = Path(__file__).with_name("browser-find.html")
     browser = os.environ.get("CTHULHU_FIREFOX") or shutil.which("firefox")
     if not browser:
         raise RuntimeError("Firefox executable not found")
@@ -40,8 +43,13 @@ def run_inside():
                     if process.poll() is not None:
                         log.seek(0)
                         raise RuntimeError("Firefox exited before the probe: " + log.read().decode(errors="replace"))
+                    windowName = "Cthulhu Firefox Baseline"
+                    if find:
+                        windowName = "Cthulhu Browser Probe"
+                    elif linked:
+                        windowName = "Cthulhu Linked Headings Probe"
                     result = subprocess.run(
-                        ["xdotool", "search", "--onlyvisible", "--name", "Cthulhu Linked Headings Probe" if linked else "Cthulhu Firefox Baseline"],
+                        ["xdotool", "search", "--onlyvisible", "--name", windowName],
                         capture_output=True, text=True,
                     )
                     if result.stdout.strip():
@@ -53,6 +61,13 @@ def run_inside():
                     raise RuntimeError("Firefox fixture window missing")
                 environment["CTHULHU_NATIVE_FIREFOX"] = "1"
                 environment.setdefault("GOCACHE", "/tmp/cthulhu-cache")
+                if find:
+                    subprocess.run(
+                        ["go", "test", "./internal/app", "-run", "^TestNativeBrowserFind$",
+                         "-count=1", "-v", "-timeout=35s"],
+                        cwd=ROOT, env=environment, check=True, timeout=40,
+                    )
+                    return
                 if linked:
                     environment["CTHULHU_NATIVE_LINKED_HEADINGS"] = "1"
                     subprocess.run(