docs: clarify docker power-user setup

docs/tools/browser.md

@@ -326,6 +326,20 @@ If you see `Playwright is not available in this gateway build`, install the full
 Playwright package (not `playwright-core`) and restart the gateway, or reinstall
 OpenClaw with browser support.
 
+#### Docker Playwright install
+
+If your Gateway runs in Docker, avoid `npx playwright` (npm override conflicts).
+Use the bundled CLI instead:
+
+```bash
+docker compose run --rm openclaw-cli \
+  node /app/node_modules/playwright-core/cli.js install chromium
+```
+
+To persist browser downloads, set `PLAYWRIGHT_BROWSERS_PATH` (for example,
+`/home/node/.cache/ms-playwright`) and make sure `/home/node` is persisted via
+`OPENCLAW_HOME_VOLUME` or a bind mount. See [Docker](/install/docker).
+
 ## How it works (internal)
 
 High-level flow: