For browser action icon, according to browserAction documentation:
Do use big, colorful icons that make the most of the 38x38-pixel space. Browser action icons should seem a little bigger and heavier than page action icons.
Currently that icon looks a little bit too small compared to other extensions:

Also, according to the images guideline for Chrome Web Store:
A circular icon should have a diameter of approximately 112 pixels, or 85% to 90% of the image width.
We might need to check the size of the app icon as well.
@FelisCatus , now I am working on this issue and will send you PR soon.
I've written a new script and some SVGs using arcs instead of bezier curves. Let's see if this works as intended.
@celeron533 Please also test on OS X if possible. I would really appreciate your help.
Note that in the new scripts & SVGs, all values are exact (multiples of 0.25), which means no rounding is necessary even when converted to binary floating point.
I just checked the developer guideline. It seems that 19x19 icons are no longer recommended... Instead, we should now use 16x16 and 24x24, 32x32 for different devices with scaling. I guess I need to update the sizes now.
A simple check shows that the PNG icons are occupying around 87.5% of the image size, which means the PNG icons does not need to be updated. Those images already follow the images guideline for Chrome Web Store.
Updated. Please try again.
Tested on my Windows 10 machine, looks pretty good.
And sorry, I haven't got any Mac machine... :apple:
Release 2.4.0 is on the way with enlarged icons. Only browser action icons and favicons are affected. Others are unchanged.
2.4.0 has been released.
Great thanks for your work, @FelisCatus !
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Great thanks for your work, @FelisCatus !