Icons for Firebird:

(Name)(SquareMetric[xHeight])[*twinkle variant required]

Status Bar - Insecure16, Secure16, Mixed16, Broken16, Page Themes16, Popup Info16
Toolbar Other - Search16, Go20*, Close Tab18x14*
Toolbar - Back32/20*, Forward32/20*, Stop32/20*, Reload32/20*, Home32/20*, Downloads32/20*, History32/20*, Bookmarks32/20*, Print32/20*, New Tab32/20*, New Window32/20*, Cut32/20*, Copy32/20*, Past32/20*
Bookmarks - New Bookmark32*, New Folder32*, New Separator32*, File Bookmark32*, Bookmark Properties32*, Rename Bookmark32*, Delete Bookmark32*, Bookmark16*, Bookmark Folder16, Bookmark Folder Open16, 
Options - General32, Privacy32, Web Features32, Themes32, Extensions32, Advanced32
Documents and Folders - Document16, Folder Open16, Folder Closed16, Up Directory20, New Folder20, Trash20
Printing - Portrait32/16, Landscape32/16

Throbber - Large Animating32/20
Messages - Query32, Information32, Alert32, Error32

All up - 47 basic elements + 24 twinkle variants. We do the disabled by desaturating and making translucent.