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Is it possible to run a TamperMonkey Script only once ?

According to me TamperMonkey Script are always executed when the url location does match so I was wondering to know if there was a way to execute a script only once and then to disable it for exemple. So when I refresh the page the script will not be executed again.

Is it possible ?

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2 Answers 2

Reset to default
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Sure.

You could use GM_setValue and GM_getValue to save the URL you run on, and if the URL had already been saved, not re-run the script.

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3 Comments

But what if I want to use 2 different script on a same url ? For exemple : I load 1page script is executed, I refresh the page other script is executed
are GM a kind of global variable ?
I think they're scoped to each userscript.
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If you want to share info between scripts, you can use localStorage, but:

  • Local storage is not eternal, meaning it can get deleted after a long time
  • Scripts from the webpage itself can read the same local storage meaning they can compromise or detect your script (theoretically)
  • Also, just like with GM_setValue, remember that you don't know in which order the scripts will access the value.
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