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What to do if you see the error "Firefox.app can't be opened because the identity of the developer cannot be confirmed." after installing Firefox on your Mac.

{for win, linux}{warning}This issue applies to Mac devices only.{/warning}{/for} After you [[How to download and install Firefox on Mac|download and install Firefox on your Mac]] you may see the error message, '''"Firefox.app" can't be opened because the identity of the developer cannot be confirmed''' when you try to open it. Apple has made a security change to Mac OS X 10.9.5 which may cause this error and block you from using Firefox. Here are some steps you can take if this happens: = Option 1 - Recommended = # Hold down the {key Control} key while clicking on the Firefox icon in the Dock or on the Firefox application file in a Finder window. # Click {menu Open} in the context menu. # Click {button Open} in the following dialog window. See [http://support.apple.com/kb/PH14369 OS X Mavericks: Open an app from an unidentified developer] for more information. = Option 2 - Open Firefox through the System Preferences = # Click on the Apple icon at the top left corner of your screen and open {menu System Preferences…}. # Click on {menu Security & Privacy}, then the {menu General} tab. # You'll see a message stating that the ''Firefox.app'' was blocked. Click on {button Open Anyway}: #;[[Image:blocked firefox mac]]