make it compatible with kiwibrowser a chromium fork (5m user)

[mycal123]

Describe the bug

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To Reproduce

Steps to reproduce the behavior:

1. Go to URL '...'
2. Click on '....'
3. Scroll down to '....'
4. Got error '....' / see screenshot / etc.

Expected behavior

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Screenshots

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System (please complete the following information):

• OS: [e.g. Mac OS X 10.13.5, Windows 10.0.0, 18.04.1 LTS]
• Browser and version [e.g. Chrome v68.0.3440]
• Extension version [e.g. 4.8] (get from chrome://extensions/?id=fdpohaocaechififmbbbbbknoalclacl)

Additional context

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[mrcoles]

@mycal123 this is an issue with Kiwi not supporting the captureVisibleTab API https://github.com/kiwibrowser/src/issues/304