This looks very useful, it sometimes is a bit irritating to copy paste several Tx-IDs and/or addresses into a block explorer and this extension will really come in handy but I would have been more interested in this if it was a Firefox addon, I don't use chrome that much and I hope you can develop something similar for FF as well.
Chrome Extension development is much easier (and more within my expertise). Also, if you look at the browser usage stats:
http://www.w3schools.com/browsers/browsers_stats.asp, it's pretty obvious that Chrome is the browser to be putting effort into in 2015.
So should I try to convince you to switch to Chrome? Aside from all its superior things (notice amazing argument tactics), I have my awesome extension for it (so that's obviously enough reason to switch right there).
Honestly though, I'd consider making the switch (a little off-topic, but why not)...not to get into a browser war or anything though (I swear that's not what I'm trying to do) [btw Mac is better than PC...shots fired]
Hope you'll check it out in Chrome when it's officially released on the extension store regardless!
