# Return that addons is corrupted while downloading

**URL:** <https://discourse.mozilla.org/t/return-that-addons-is-corrupted-while-downloading/129068>\
**Category:** Add-ons\
**Created:** [March 28, 2024, 8:06pm UTC](https://discourse.mozilla.org/t/return-that-addons-is-corrupted-while-downloading/129068 "2024-03-28T20:06:52Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Midicix\_Corporation](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@Midicix\_Corporation](https://discourse.mozilla.org/u/Midicix_Corporation)\
**Post date:** [March 28, 2024, 8:06pm UTC](https://discourse.mozilla.org/t/return-that-addons-is-corrupted-while-downloading/129068/1 "2024-03-28T20:06:52Z")

</div>

![bug](https://us1.discourse-cdn.com/flex001/uploads/mozilla/original/3X/7/9/79feba7e6d68c972564abb9de5a9572a74ca273a.png)  
I try to download my own extension for testing, but i receive this error message “Installation aborted because the add-on appears to be corrupt.”. I check all my files, but nothing are different than before when it’s running perfectly. I remove my addons and repost in the store, but the error come back. Someone could help me ?

---

<div class="post-metadata">

**Author:** ![hans\_squared](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/hans_squared/32/67424_2.png) [@hans\_squared](https://discourse.mozilla.org/u/hans_squared)\
**Post date:** [March 28, 2024, 8:27pm UTC](https://discourse.mozilla.org/t/return-that-addons-is-corrupted-while-downloading/129068/2 "2024-03-28T20:27:46Z")

</div>

I downloaded “midip-1.0.0.xpi” from [MidIP – Get this Extension for 🦊 Firefox (en-US)](https://addons.mozilla.org/en-US/firefox/addon/midip/) and unzipped it.

When I loaded it as a temporary extension, Firefox showed an error message.

Error message text:

> There was an error during the temporary add-on installation.  
> Error details  
> Extension is invalid  
> Reading manifest: Error processing developer: Unexpected property “websiteUrl”

Error message screenshot:

 ![grafik](https://us1.discourse-cdn.com/flex001/uploads/mozilla/original/3X/9/a/9a53a3e5600122445e6c50a614ac3e76a6816d70.png)

See [manifest.json \> developer](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/developer) for the correct key name.

---

<div class="post-metadata">

**Author:** ![Midicix\_Corporation](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@Midicix\_Corporation](https://discourse.mozilla.org/u/Midicix_Corporation)\
**Post date:** [March 28, 2024, 9:26pm UTC](https://discourse.mozilla.org/t/return-that-addons-is-corrupted-while-downloading/129068/3 "2024-03-28T21:26:06Z")

</div>

Thanks, now it runs perfectly !