You may have accidentally added the DMG/install volume to your bar and it keeps reopening the install dmg when you click on it. See if the instructions here help:

https://superuser.com/questions/192429/how-do-i-get-rid-of-a-dmg-file-which-appears-after-reboot-on-my-desktop

Make sure you install Firefox properly.

Open the Firefox Disk Image file and drag the Firefox application to the Applications folder on your hard drive. You shouldn't double-click the Firefox application to run it from the Disk Image, but instead drag it out of the DMG folder.

• https://support.mozilla.org/en-US/kb/install-firefox-mac

Sorry, maar dat is nu juist het probleem, ik sleep het programma naar programma map en open vanuit programma's Firefox. Ik heb de dmg verwijderd. Maar toch blijft hij iedere keer terugkomen.

Did you eject the DMG file before trying to remove the file as stated in step 4 ?

• https://support.mozilla.org/en-US/kb/install-firefox-mac

See also:

• http://kb.mozillazine.org/Installing_Firefox#Mac_OS_X