Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Fetching extension fails under MITM proxy even if certificate is added

  • 3 replies
  • 0 have this problem
  • 1 view
  • Last reply by GamePlayer

GamePlayer
GamePlayer
more options

Good afternoon,

I've got a problem with add-ons while using Squid MITM Proxy with a custom certificate for Firefox/LibreWolf.

While I'm trying to update / install an extension / theme, it fails with:

``` 1686147276233 addons.xpi WARN Download of https://addons.mozilla.org/firefox/downloads/file/4104397/witchdoctor-2.0.xpi failed: [Exception... "Certificate issuer is not built-in." nsresult: "0x80004004 (NS_ERROR_ABORT)" location: "JS frame :: resource://gre/modules/CertUtils.sys.mjs :: checkCert :: line 177" data: no] Stack trace: checkCert()@resource://gre/modules/CertUtils.sys.mjs:177 onStopRequest()@resource://gre/modules/addons/XPIInstall.jsm:2514 ```

How can I install an add-on while using the MITM proxy?

Good afternoon, I've got a problem with add-ons while using Squid MITM Proxy with a custom certificate for Firefox/LibreWolf. While I'm trying to update / install an extension / theme, it fails with: ``` 1686147276233 addons.xpi WARN Download of https://addons.mozilla.org/firefox/downloads/file/4104397/witchdoctor-2.0.xpi failed: [Exception... "Certificate issuer is not built-in." nsresult: "0x80004004 (NS_ERROR_ABORT)" location: "JS frame :: resource://gre/modules/CertUtils.sys.mjs :: checkCert :: line 177" data: no] Stack trace: checkCert()@resource://gre/modules/CertUtils.sys.mjs:177 onStopRequest()@resource://gre/modules/addons/XPIInstall.jsm:2514 ``` How can I install an add-on while using the MITM proxy?

All Replies (3)

Dropa
Dropa
more options

If the certificate is failing you should contact their customer service support about this issues since that extension is from them. Addon install issues should contact their Developer for support on their Addon.

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You can try to download and save the extension's XPI file and install the extension via the about:addons page via the cogwheel menu.

GamePlayer
GamePlayer Question owner
more options

At the moment there's no way to install extension through MITM?