Bug: Extension is non-responsive after computer lock

System: Macbook pro - MacOS Big Sur 11.3.1 (model 2018)
VSCode:
```
Version: 1.57.1
Commit: 507ce72a4466fbb27b715c3722558bb15afa9f48
Date: 2021-06-17T13:28:32.912Z (2 wks ago)
Electron: 12.0.7
Chrome: 89.0.4389.128
Node.js: 14.16.0
V8: 8.9.255.25-electron.0
OS: Darwin x64 20.4.0
```
Browser preview v0.7.1

First, thanks for the extension! I started using it recently and noticed that it sometimes became unresponsive.
After a bit I noticed that this happens when I unlock my computer (I lock with the key combination Ctrl + Command + Q).
I usually have to restart the tab because I can't click anywhere (address bar is not responding, or any of the website content).

No source file or test is named in the report. First reproduce the lock/unlock sequence on the stated macOS and VS Code setup, then trace the browser preview lifecycle; done means the preview remains interactive after unlock without restarting the tab.

Written by the indexing model from the issue text.