When you download files in Firefox and Safari and then open them you will get a message asking you if you want to open the file. It goes along the line of ‘”Example” is an application you have downloaded from the internet, are you sure you want to open it’, with various options. Its designed as a message barrier to stop you opening malicious files that could harm your Mac. The problem I have is that its a bit annoying and I know what I am downloading, if only there was some way of disabling this message. Thankfully there is, and like may commands to change preferences it is a one liner and only takes a couple of moments.
To remove the message, open up Terminal in the Applications > Utilities folder, then copy and paste the following.
defaults write com.apple.LaunchServices LSQuarantine -bool NO
Then restart your Mac. If you download an app or other file that triggers the warning you should notice that the message no longer appears. The only problem with this tips is that you are removing a layer of security, but you can always click on Open in the original message, which reduces its effectiveness.
If you ever want to revert the process copy and paste the following into Terminal and hit enter.
defaults write com.apple.LaunchServices LSQuarantine -bool YES
Once again, restart your Mac and the changes should take effect. I’ve not tested this second command, I assume it will work.
If you have any questions or comments please leave a comment below.