diff --git a/frontend/src/hooks/useVideoSource.ts b/frontend/src/hooks/useVideoSource.ts
index e2a0a38d7..e6997f00c 100644
--- a/frontend/src/hooks/useVideoSource.ts
+++ b/frontend/src/hooks/useVideoSource.ts
@@ -83,8 +83,23 @@ export function useVideoSource(props?: UseVideoSourceProps) {
             video
               .play()
               .then(() => {
-                // Draw video frame to canvas at original resolution
-                const drawFrame = () => {
+                // Use captureStream(0) for manual frame capture to avoid
+                // GPU stalls from automatic ReadPixels at mismatched rates.
+                // See: https://github.com/daydreamlive/scope/issues/509
+                const stream = canvas.captureStream(0);
+                const videoTrack = stream.getVideoTracks()[0];
+
+                // Draw video frames to canvas at the target FPS rate only,
+                // then manually request a frame capture. This avoids the
+                // "GPU stall due to ReadPixels" warning caused by drawing
+                // at ~60fps via requestAnimationFrame while capturing at a
+                // lower rate.
+                const intervalMs = 1000 / fps;
+                const intervalId = setInterval(() => {
+                  if (video.paused || video.ended) {
+                    clearInterval(intervalId);
+                    return;
+                  }
                   ctx.drawImage(
                     video,
                     0,
@@ -92,14 +107,24 @@ export function useVideoSource(props?: UseVideoSourceProps) {
                     detectedResolution.width,
                     detectedResolution.height
                   );
-                  if (!video.paused && !video.ended) {
-                    requestAnimationFrame(drawFrame);
+                  // Manually request frame capture from the stream
+                  if (
+                    videoTrack &&
+                    "requestFrame" in videoTrack &&
+                    videoTrack.readyState === "live"
+                  ) {
+                    (
+                      videoTrack as MediaStreamTrack & {
+                        requestFrame: () => void;
+                      }
+                    ).requestFrame();
                   }
-                };
-                drawFrame();
+                }, intervalMs);
 
-                // Capture stream from canvas at original resolution
-                const stream = canvas.captureStream(fps);
+                // Clean up interval when track ends
+                videoTrack?.addEventListener("ended", () => {
+                  clearInterval(intervalId);
+                });
 
                 resolve({ stream, resolution: detectedResolution });
               })
diff --git a/src/scope/core/plugins/manager.py b/src/scope/core/plugins/manager.py
index 5605893ff..8d1ac0294 100644
--- a/src/scope/core/plugins/manager.py
+++ b/src/scope/core/plugins/manager.py
@@ -660,8 +660,10 @@ def _list_plugins_sync(self) -> list[dict[str, Any]]:
                                 )
 
                     # For git packages, use the git URL; for PyPI, use package name
+                    # Strip .git suffix - not needed for pip/uv and causes issues
+                    # when web platform parses the URL for GitHub API calls (#508)
                     package_spec = (
-                        f"git+{git_url}"
+                        f"git+{git_url.removesuffix('.git')}"
                         if source == "git" and git_url
                         else package_name
                     )