Merge pull request #2 from ColinPugh/worldcat-update

swapped nypl with worldcat
Update manifest.json

fixed typo
Merge pull request #4 from ColinPugh/patch-2

Update manifest.json
bump to version 2.0.0 now that it goes to worldcat
added screenshot
updated with new robinbook link
added firefox support. pew pew pew. yer next safari
added safari
Merge pull request #1 from dbgrandi/master

added firefox support