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localStorage removeitem not working on Chrome/Firefox extension

I'll try to delete a localStorage Item in JS with my Chrome/Firefox extension, but it seems like it won't work, and now I would like to know how can I debug this problem, here my code from my popup.js:

var btn = document.createElement("BUTTON");
btn.innerText = "Delete matchs";
btn.onclick = function () {
    localStorage.removeItem('save_to_storage');
};

my popup.html:

<!DOCTYPE html>
<html lang="de">
  <head>
    <script src='popup.js' defer></script>
  </head>
    <body>
      <div id='button'></div>
    </body>
</html>

If I press the button Delete matchs the save_to_storage item still appears in my developer tools, but if i type directly into the console localStorage.removeItem('save_to_storage'); it works as expected. I test it in firefox and chromium.

I also tried to get the value of this item by using alert(localStorage.getItem('save_to_storage')); instead of localStorage.removeItem('save_to_storage'); in my popup.js but this alert was empty.

Can it be that my popup.js can't access this item? and if yes how can I solve this?

Test Enviroment:

Chromium Version 92.0.4515.107 (Offical Build) Arch Linux (64-Bit)
Mozilla Firefox 90.0.2 (64-Bit) for Arch Linux

Regards

Lucki1000

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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