Workaround for Zotero Connector missing in Safari

dstillman

This discussion was created from comments split from: Zotero Connector missing in Safari (macOS Sonoma) — tried everything.

HansJoakimPersson

I've seen countless threads about this issue in Safari, and the fix almost always comes down to completely reinstalling the Zotero app. However, there's a workaround that has consistently worked for me without needing to do that.

What I've found is that if you enable Safari's Developer menu and allow unsigned extensions, the Zotero Connector suddenly reappears.

Go to Safari > Settings > Advanced
Check the box: Show features for web developers
A new Developer tab item will appear
From there, select: Developer > Allow Unsigned Extensions

After doing this, the Zotero Connector becomes immediately visible and functional again, you don't even need to restart Safari.

I’m not entirely sure whether this triggers a refresh of Safari’s extension loading mechanism or if it's related to how the Zotero extension is signed, but either way, it works.

Important: Only do this if you know what you're doing, and please avoid installing any other unsigned extensions unless you fully trust the source.

dstillman

the fix almost always comes down to completely reinstalling the Zotero app

Note that we also suggest compressing → deleting → uncompressing as an alternative. I'd recommend that over toggling developer settings for most people.

I’m not entirely sure whether this triggers a refresh of Safari’s extension loading mechanism

It'd be worth checking if it still works after disabling the setting again. That would clarify whether it's triggering a recompute of the signature or just ignoring the error.

In any case, the bug here is related to signature checking, yes, but it's not a problem with Zotero's signature — when it's not working, you can verify the app's signature with codesign and it passes, and of course, if it were a signature problem, compressing and uncompressing the app wouldn't fix it. My guess is that macOS recomputes the signature while Zotero is still in the middle of updating its files, there's a signature mismatch between the app and the plugin, and then it never checks again. I don't know why it happens during Zotero's update process specifically.

apf102

Thanks so much!! This has been driving me insane. Did the process you suggested and then turned off the unsigned extensions option afterwards and it seems to stay there.

sjsjs

Hallelujah! Thank you for posting this fix. I toggle the unsigned extensions feature on/off and it instantly fixes the problem without too much of a security problem, since it still works if you immediately turn the setting off again. With this fix I can continue to use Zotero until the developers figure out how to resolve this permanently.

Sidenote with my circumstances for QA purposes: The Safari extension disappears from the Extensions pane in the Settings window, so I have to reinstall Zotero to get it back. It's very frustrating to have to continually do this, which interrupts my workflow. It's happening once a week and making the software a problem to use.

My system details, in case anyone's keeping track:
MacOS 15.6 (24G84)
Zotero 7.0.24
Safari Version 18.6 (20621.3.11.11.3)

emchateau

Thanks a lot, it works really well.

Appart from this problem of the extension disappearing, I also frequently have issues with the recognition of content. I need to regularly to reload Safari to use the extension and be able to import a reference.

MacOS 15.6 (24G84)
Zotero 7.0.24 
Safari Version 18.6 (20621.3.11.11.3)

martyrcalvin

This worked for me. Thank you so much.

aserikss

Thanks! Reappeared immediately. Update of Zotero did NOT do the trick

GBaby217

This did not work for me. :( I then tried to compress, delete, and unzip method, and when I decompress it it tells me the file for zotero is damaged and should be moved to the trash. -_-

dstillman

@GBaby217: Reinstall Zotero from the download page.

acmartin9

Impossible to make this work, I followed all these instructions and deleted the DuckDuck privacy app as well.

EFaith

I'm here in 2026 and it isn't working

dstillman

@EFaith: Same answer.

https://www.zotero.org/support/kb/zotero_connector_and_safari#extension_not_showing_up_save_button_missing_or_flickering

pmellalieu

I've logged this report on Apple Discussions.

(2026, May 19).
Extension Zotero 9 and 10 Beta fail to install in Safari 26 on Tahoe OS Mac Mini A4 Pro 2024** [Online post].
https://discussions.apple.com/thread/256299883

I... HAVE ... TRIED.... EVERYTHING...... NO SUCCESS

This is my system:

Mac mini Pro 2024
Chip Apple M4 Pro
Memory 48 GB
macOS Tahoe 26.3
Safari 26.3

In case Apple refuses my post, here is what I said

# **Extension Zotero 9 and 10 Beta fail to install in Safari 26 on Tahoe OS Mac Mini A4 Pro 2024**

I have recently switched from using Chrome to Safari for my research and writing. A key tool in my workflow is using Zotero to manage citations, referencing, webpage shots and so on.

For countless years the Zotero extension on Chrome has worked near flawlessly for me.

I have successfully installed the Zotero extension on my MacBook Air 2019 Intel. I do recall having to conduct some gymnastics such as deleting the Zotero app, and re-installing the latest Zotero version to force the extension to be recognized and available in Safari.

However, I've spent 4 hours today NOT able to install the Zotero Extension for Safari on my modern Apple Mini Mac Pro.

I have followed advice from Google AI and the Zotero Forums, detailed below

According to those sources the intermittent failure to install the Zotero extension is a longstanding, 'known bug' which the Zotero developers attribute to Apple.

I wish Apple would urgently work with Zotero to address the issue. I'm sure it's relevant to many students and researchers.

In summary, perhaps here's a clue to a solution. Google AI reports "Why this happens on M4/Tahoe: Apple's "App Extension" architecture requires a perfect match between the app's signature and Safari's security policy. On newer chips/OS versions, even a minor cache error prevents the "Zotero Connector" from appearing in the list, even if the file is present. "

**This is my system:**

Mac mini Pro 2024

Chip Apple M4 Pro

Memory 48 GB

macOS Tahoe 26.3

Safari 26.3

Below is the advice from Zotero to attempt to get the Extension Install to function. I have repeated several versions of this approach. I have tried reinstalling  both the current Zotero version 9, and beta Version 10.

I have deleted the Zotero app, restarted the MiniMac, then redownloaded and reinstalled Zotero.

This is the guidance from Zotero

**Zotero Connector and Safari**

[https://www.zotero.org/support/kb/zotero_connector_and_safari](https://www.zotero.org/support/kb/zotero_connector_and_safari)

See subsection: **Extension not showing up? Save button missing or flickering?**

[https://www.zotero.org/support/kb/zotero_connector_and_safari#:~:text=Extension not showing up? Save button missing or flickering?](https://www.zotero.org/support/kb/zotero_connector_and_safari#:~:text=Extension not showing up? Save button missing or flickering?)

I have completed Fix 1, Fix 2, Fix 3 in various combination, both with Zotero 9 (current version) and Version 10 beta. I have restarted the computer between deleting and restoring the app.

**Using some Google AI, and Terminal Mode I confirmed the extension was ready and waiting for install.**

This is Zotero's community discussion, with the response from their technical expert, dstillman

[https://forums.zotero.org/discussion/125907/workaround-for-zotero-connector-missing-in-safari](https://forums.zotero.org/discussion/125907/workaround-for-zotero-connector-missing-in-safari)

You'll see a lot of frustration reported eg

'This has been driving me insane.'

None of the workarounds proposed have worked for me.

Google AI says possibly a problem caused by my having a late model, high performance machine! What a bother!

\===============================================

**Mac Terminal Response:**

1\. Terminal response =: << grep Zotero org.zotero.zotero.SafariExtension(5.0.199)A0B55346-4426-4CE1-808E-EA2CEA64781E2026-05-18 07:16:00 +0000/Applications/Zotero.app/Contents/PlugIns/ZoteroSafariExtension.appexbash-3.2$ >>

"The Terminal response confirms your Mac **physically sees the extension** file within the Zotero app. Since you are on a high-spec **[M4 Pro](https://www.google.com/search?ibp=oshop&prds=pvt:hg,pvo:29,mid:576462876434351353,imageDocid:16413069421999190487,gpcid:5318654525812039328,headlineOfferDocid:3133361098357732867,catalogid:9594651569190556980,productDocid:3131161794080254067,rds:PC_2942453351881586905|PROD_PC_2942453351881586905&q=product&sa=X&ved=2ahUKEwj-36S_wMSUAxVQsVYBHWXRD8IQxa4PeggIAggACCkQAg)

** Mac mini running **macOS Tahoe** (a future or beta release), the issue is likely a strict security handshake failure between Safari and the local app bundle."

high-level reset suggested by Google AI

I attempted the high-level reset suggested by Google AI, s=described here https://share.google/aimode/V01AUwq72GiST6Aud  ========================

pmellalieu

Further to my previous comment, I attempted the high-level reset suggested by Google AI, described here
https://share.google/aimode/V01AUwq72GiST6Aud

========================
1. Force a "Path Refresh"
Sometimes macOS gets stuck looking at a "ghost" path of the app.

Open your Applications folder.
Right-click the Zotero app and select Compress "Zotero".
Move the original Zotero app (not the .zip) to the Trash and empty it.
Double-click the Zotero.zip to extract it back into the Applications folder.
Launch the newly unzipped Zotero app, then check Safari Extensions.

2. Bypass Security Signing (Highly Effective)

On newer macOS versions, Safari often hides extensions it deems "unsigned" or incorrectly indexed.
Open Safari and go to Safari > Settings > Advanced.
Check Show features for web developers at the bottom.
In the top menu bar, click the new Develop menu.
Select Allow Unsigned Extensions.
Completely Quit Safari (Cmd + Q), restart it, and check Settings > Extensions.

3. Clear the macOS Extension Database
If the system database is corrupted, you can force a rebuild via Terminal:
Open Terminal.
Copy and paste this command precisely:
bash
/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
Use code with caution.
Restart your Mac immediately after the command finishes.

4. Test in Safe Mode
To rule out third-party security software or background processes blocking the injection:
Shut down your Mac mini.
Press and hold the Power button until "Loading startup options" appears.
Select your disk, hold the Shift key, and click Continue in Safe Mode.
Open Safari in Safe Mode to see if the extension appears. If it does, a background app (like an antivirus or cleaner) is the culprit.

Why this happens on M4/Tahoe:
Apple's "App Extension" architecture requires a perfect match between the app's signature and Safari's security policy. On newer chips/OS versions, even a minor cache error prevents the "Zotero Connector" from appearing in the list, even if the file is present.

None of the above has worked to solve my issue