Correctly handle "beforeunload": don't close tab on reloading
Remove "observes" attribute in Firefox 3.6 and older
Wrongly commented-out in 146f6fa9f10dd4a5f744eb536b67ce1cc9a076c8 commit, strange things happens with "observes": original "Edit button…" and "Edit button in tab…" do the same action.
Ignore CB_MODE_SAVE_EDITOR_SIZE_SEPARATELY in Firefox 3.6
Bump version to 0.1.8.3 - 2014-01-12
Install page for v. 0.1.8.3 - 2014-01-12