improvements for PDF reader - add a feature that lets you highlight without the box appearing

[kin]

I'd like to suggest that the highlighting-box (where you pick colors etc.) that appears when you choose to highlight in PDFs should be changed for increased readability. 

Rather than the box that currently steals a lot of space from the document when the highlighting-tool is active, you should add a feature that lets you highlight without the box appearing. This would increase the readability a lot! 

Thank you for providing a great browser and considering this suggestion. 

[Jon]

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