diff --git a/controller/cuda_grid_controller/browser_overlays.py b/controller/cuda_grid_controller/browser_overlays.py
index ca4ff3f..b6008a2 100644
--- a/controller/cuda_grid_controller/browser_overlays.py
+++ b/controller/cuda_grid_controller/browser_overlays.py
@@ -69,6 +69,10 @@ class DashboardCfg(BaseModel):
     )
     page_timeout_ms: int = Field(default=10000, ge=1000, le=60000,
         description="Max time to wait for page load")
+    extra_http_headers: dict[str, str] = Field(default_factory=dict,
+        description="HTTP headers для каждого request — auth tokens, custom UA. "
+                    "Пример Grafana service account: "
+                    '{"Authorization": "Bearer glsa_xxxxxxxx"}')
     opacity: float = 1.0
     z_order: int = 28
 
@@ -109,12 +113,15 @@ class BrowserRenderer:
         self.icon_dir.mkdir(parents=True, exist_ok=True)
 
         self._playwright = await async_playwright().start()
-        # Transparent background через `--default-background-color=00000000`
-        # (требует hex с alpha=00 для full transparency).
+        # Full chromium (не headless-shell) — нужен для `--default-background-color`
+        # transparency support. headless-shell incompatible с remote debugging при
+        # этом флаге. channel="chromium" → use full browser binary (~170MB,
+        # установлен через `playwright install chromium`).
         self._browser = await self._playwright.chromium.launch(
+            channel="chromium",
             headless=True,
             args=[
-                "--default-background-color=00000000",
+                "--default-background-color=00000000",  # hex alpha=00 = full transparent
                 "--no-sandbox",  # требуется в docker root context
                 "--disable-dev-shm-usage",  # /dev/shm в Docker обычно мал
                 "--disable-gpu",  # headless без GPU OK для PIL
@@ -128,6 +135,8 @@ class BrowserRenderer:
                 page = await self._browser.new_page(
                     viewport={"width": vw, "height": vh},
                 )
+                if cfg.extra_http_headers:
+                    await page.set_extra_http_headers(cfg.extra_http_headers)
                 # background_color в new_context не работает для transparent — used CLI arg
                 await page.goto(cfg.url, wait_until=cfg.wait_until,
                                 timeout=cfg.page_timeout_ms)