fix for when activeTab.url is not yet defined
remove &nbsp;s Fixes #106
shorten code
append CSS before JS
Merge pull request #107 from zombie/patch-1

fix for when activeTab.url is not yet defined
Merge pull request #108 from nickdesaulniers/patch-1

activeTab.url may be undefined in FF add on
Merge pull request #110 from nickdesaulniers/nbsp

remove &nbsp;s Fixes #106