Safari extension support

[mwarkentin]

It would be great to support this extension in Safari!

Apple has some docs about converting an existing web extension for use in Safari so maybe this wouldn't be too much work. :)

[eliatcodecov]

Thanks for posting! I can't give a definitive time frame on this, but we'll take a look and see how much work would go into this. If it's straightforward, we can try to slot it in.