I have a pop up which I can't get rid of which states: "There is no application set to open the URL ximadpzl://save_ximad_token----/"

Open the Finder. From the Finder menu bar click Go > Go to Folder

Type or copy paste the following;

~/Library/Safari

Click Go then move the History.plist and LastSession.plist and Downloads.plist files to the Trash.

Restart your Mac and try Safari.

I'm running OS X version 10.9.2

I tried this solution but get this error message: "The folder can't be found."

Also poked around a bit looking for the History.plist etc. files but couldn't find them either.

What am I doing wrong?

Thanks.

Worked for me. Thanks. A pop up that you can not close has to be almost as bad as downloading an application and you can no longer use you computer. Almost as bad!

All of these suggestions (delete caches, restart, terminal commands, etc) do nothing to actually LOCATE the problem. They are just standard purging processes, and they have all failed to achieve resolution. And it is NOT Little Snitch either (tried turning that off and nothing changed). All these forums on this matter have been speculative and useless.

Ladies and Gents... I have found and isolated the ACTUAL PROBLEM. It is a Safari Extension that is doing it... specifically "VideoCatcher 5.3.8" which for me was installed with MovieSherlock. The extension adds the ability to download YouTube movies directly from Safari (by showing a small download button next to any embedded movie). When I remove that extension, all the annoying pop-ups go away.

MovieSherlock is not the only utility that does this however. There are several YouTube downloaders out there that ALL install an extension that detects YouTube videos on the page. I bet my hat that many (if not all) of you who are experiencing this pop-up issue... have installed one of those downloader utilities.

So, the solution is simple: disable that extension. If you need to download a YouTube video from a page, either temporarily enable that extension again as needed, or leave the Safari integration disabled and launch the actual utility itself and enter the URL into it for your download.

I would expect that MovieSherlock and the other YouTube downloading utilities will need to update their extensions (soon?) to deal with Yosemite's new browser script management.

PROBLEM SOLVED.

Thanks, cliffinoregon!

I have removed a VideoCatcher from Safari extentions and got no this terrible pop up window any more.

Appreciate your advise!

PS previous advise from Carolyn Samit din't help.

I searched my Mac for the folder Safari. In it were Bookmark and History folders. I deleted all files in History folder. Problem solved.

You nailed it.

Thanks!

I tried all the other solutions, but only yours worked in my case, thanks!

MovieSherlock needed an update. That fixed it. Thank you.