Need to install for but mac says that firefox is already installed and I cannot find it.

I am trying to install TOR (had many moons ago and thought I closed it). It says that firefox is already running and I can't open it twice. Possibly I have firefox and possibly I don't. I cannot find it anywhere, nothing to drag to the trash. I want to reinstall it after, but I can't find it anywhere in my computer. I just get the warning when I try to install TOR.

Hello  ,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING:Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

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I get the impression you are quite familiar with the trade-in process and how the bonus is applied, and it is disappointing to hear that a store associate wouldn't attempt to complete that process. I will be sending you a private message so we can get some more specific information regarding which store you were at as well as the trade in question where you did not receive the bonus. Please watch for a message from me shortly.
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Need to install for but mac says that firefox is already installed and I cannot find it.

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