Using Link Map on Vivaldi

[Serl0p]

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Description

I'm switching from Chrome to Vivaldi, and I was hoping to be able to export all the current open tabs on Chrome (500+) to my Link Map Tree on Vivaldi, but even though the extension is able to open the exported file, it doesn't allow me to "drag and drop" the nodes from one window to the other.

Steps to reproduce (if applicable)

1. On Chrome, export Tree Map
2. On Vivaldi, go to import
3. Vivaldi opens the exported tree on a new window
4. I try to "drag and drop" from one window to the other, but it won't let me

Expected behavior

I was hoping I could use the import option just as I do on Chrome

Actual behavior

It doesn't allow to "drag and drop"

Screenshots (if applicable)

Can't take screenshots to show the issue

Additional information

[I'm unsure if this issue is on Vivaldi's side or on the side of this extension, but I'm hoping you can try to fix it and at the same tie I'll try to contact them to see if there's anything that the developers at Vivaldi can do.

Thank you!