Extension causes high cpu load

[hjtchu]

• Issue Type: Performance
• Extension Name: open-html-in-browser
• Extension Version: 2.1.2
• OS Version: Windows_NT x64 10.0.18362
• VSCode version: 1.41.1

⚠️ Make sure to attach this file from your home-directory:
⚠️C:\Users\Trang\peakchen90.open-html-in-browser-unresponsive.cpuprofile.txt

Find more details here: https://github.com/microsoft/vscode/wiki/Explain-extension-causes-high-cpu-load