Edit:
We have fixed the issue with Version 2.0. please update your extension.
for more, take a look at the release note

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Hello user,

Thanks for pointing that out 🙏.

You’re right at the moment, the web marker plugin loses its state once it’s closed. We’ll be adding a retain state feature soon so your highlights and markers will persist across sessions.

We plan to store the state, which will let us restore your markers when you re-open the plugin or reload the page. This way, you won’t lose your work anymore.

We’ll keep you updated as soon as this feature is available.

Best