Application Search Engines ========================== Firefox defines various application search engines that are shipped to users. The extensions for the definitions of these engines live in :searchfox:`browser/components/search/extensions ` Icons ----- Icon Requirements ~~~~~~~~~~~~~~~~~ It is preferred that each engine is shipped with a ``.ico`` file with two sizes of image contained within the file: * 16 x 16 pixels * 32 x 32 pixels Some engines also have icons in :searchfox:`browser/components/newtab/data/content/tippytop `. For these engines, there are two sizes depending on the subdirectory: * ``favicons/``: 32 x 32 pixels * ``images/``: preferred minimum of 192 x 192 pixels Updating Icons ~~~~~~~~~~~~~~ To update icons for application search engines: * Place the new icon file in the :searchfox:`folder associated with the search engine `. * Increase the version number in the associated manifest file. This ensures that the add-on manager properly updates the engine. * Be aware that the :searchfox:`allowed-dupes.mn file ` lists some icons that are intended as duplicates. To update icons for tippytop: * Place the new icon file in :searchfox:`both the sub-folders within the tippytop directory `.