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# 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 <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/topsites/content/tippytop <browser/components/topsites/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 <browser/components/search/extensions>`.
- 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 <browser/installer/allowed-dupes.mn>`
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 <browser/components/topsites/content/tippytop>`.