# Firefox Containers addon disappeared after update

**URL:** <https://discourse.mozilla.org/t/firefox-containers-addon-disappeared-after-update/57336>\
**Category:** addons.mozilla.org\
**Created:** [April 6, 2020, 8:38am UTC](https://discourse.mozilla.org/t/firefox-containers-addon-disappeared-after-update/57336 "2020-04-06T08:38:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![devzone](https://avatars.discourse-cdn.com/v4/letter/d/ce73a5/32.png) [@devzone](https://discourse.mozilla.org/u/devzone)\
**Post date:** [April 6, 2020, 8:38am UTC](https://discourse.mozilla.org/t/firefox-containers-addon-disappeared-after-update/57336/1 "2020-04-06T08:38:37Z")

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Hello,

my firefox version was recently bumped with a minor update, from 74.0.0 to 74.0.1 and the extension stopped working entirely.

I was looking at the changes introduced in the latest patch ([https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/](https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/)) and clearly they were only related to security fixes, so I wonder how can this patch prevent my addon from working.

I decided to uninstall the addon completely and install it again, just in case to be sure, but the installation is prevented with the following message `Installation aborted because the add-on appears to be corrupt.`

I looked up the GitHub page for recent issues, but there weren’t any. Also the latest release for this addon is from 28th of February, so if something really went broken I guess it should’ve been fixed by now.

If anyone else is experiencing the same problem, or can give me a heads-up what went wrong, please reply in this thread.

Thank you.

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**Author:** ![caitlin](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/caitlin/32/6091_2.png) [@caitlin](https://discourse.mozilla.org/u/caitlin)\
**Post date:** [April 6, 2020, 6:09pm UTC](https://discourse.mozilla.org/t/firefox-containers-addon-disappeared-after-update/57336/2 "2020-04-06T18:09:08Z")

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Hi @devzone, sorry for the inconvenience. There are a few things that might be causing this. Can you check in on the following?

- Do you have antivirus software installed?
- Is your OS clock up-to-date?
- Does this problem persist if you restart Firefox?

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**Author:** ![devzone](https://avatars.discourse-cdn.com/v4/letter/d/ce73a5/32.png) [@devzone](https://discourse.mozilla.org/u/devzone)\
**Post date:** [April 7, 2020, 6:19am UTC](https://discourse.mozilla.org/t/firefox-containers-addon-disappeared-after-update/57336/3 "2020-04-07T06:19:45Z")

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Hey @caitlin, thanks for the reply. No worries, it’s not your fault.

As for the questions you asked, I can assure you, it’s not OS related for sure, I am capable enough of maintaining my OS.

But anyway, won’t hurt if I answer them.

- No, I do not have one, I am using Linux.
- Yes, all regional settings are up-to date and not affected at all.
- Yes, it does. The plugin actually disappeared after I restarted firefox. I was able to see it in the list with installed plugins, but the source code was not rendering anything.

Just to let you know, I really use this plugin a lot, so in retrospective, I have completely removed my installation and downloaded the archive for 74.0.0, started it with new profile and I was able to install the plugin with no problems.

I might try to update Firefox once again, since I now know for sure it works under 74.0.0.

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**Author:** ![caitlin](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/caitlin/32/6091_2.png) [@caitlin](https://discourse.mozilla.org/u/caitlin)\
**Post date:** [April 7, 2020, 2:51pm UTC](https://discourse.mozilla.org/t/firefox-containers-addon-disappeared-after-update/57336/4 "2020-04-07T14:51:59Z")

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Thanks @devzone! Antivirus software and OS clocks are the usual culprits.

Can you [file an issue](https://bugzilla.mozilla.org/enter_bug.cgi?product=WebExtensions) for this? It would be helpful if you could copy/paste the info on `about:support` into the issue. We’ll take a look at what’s going on.