Certificate checking

Certificate checking was something asked about. Initially I brushed it off, but why not push it now it exists?

Better branding

I hated not being able to see the icon unless hovered (and only just about), so I've been playing about as per issue #2

This is mostly styling, there is a disabled state now though, which persists if we cannot change the button / link URL to your active tab (unsupported scheme or internal url's such as about://config, extensions page, non http / https

Version available on chrome & Firefox webstore as 0.0.2

This is the second release.

The first release 0.0.1 had an issue with using the white SVG icon from https://ohdear.app website, firstly that it was not square, and then that chrome store extensions apparently don't support.

Loading unpacked extension (sort-of) does.