Theme editor stopped working on firefox

David_Arbias · March 29, 2026, 4:33am

Short description of issue

Theme editor stopped working on firefox because it keeps trying to open the wrong link.

Link to Shopify Store

https://admin.shopify.com/store/12bcx3-bb

Reproduction steps

Open any store on firefox
go to themes
try to open any theme at theme editor
Shopify will redirect to the wrong link and give a 500 error (it will try to open the link at https://admin.shopify.com/admin/themes/156975628419/editor instead of https://admin.shopify.com/store/12bcx3-bb/themes/156975628419/editor
if you copy and paste the right link (https://admin.shopify.com/store/12bcx3-bb/themes/156975628419/) and click any other section (e.g. app extensions), Shopify will redirect to the wrong link and give a 500 error (it tries to open https://admin.shopify.com/admin/themes/156975628419/editor?context=apps instead of https://admin.shopify.com/store/12bcx3-bb/themes/156975628419/editor?context=apps)

Additional info

Running latest version of Firefox 149.0, MacOs Sequoia 15.7.4

What type of topic is this

Bug report

Upload screenshot(s) of issue

David_Arbias · March 30, 2026, 2:30pm

I’ve just checked and it seems this does not occur in checkout editor.

David_Arbias · March 31, 2026, 3:49am

Opening any app also shows the same problem.

Haven’t been able to use store admin for the past 2 days.

Paige-Shopify · March 31, 2026, 4:45am

Hi David,

Thanks for reaching out about this. Does clearing your browser cache and cookies help resolve the issue?

Paige-Shopify · March 31, 2026, 5:15am

Update: Our investigation is pointing to a platform-side issue. We’re working on it.

David_Arbias · March 31, 2026, 7:30am

Yes, I’ve tried everything even an anonymous tab and new firefox container.

It only occurs on firefox, doesn’t happen in safari, chrome or brave.

Paige-Shopify · April 1, 2026, 4:02am

Thanks for sharing that context with us.

We’ve just shipped a fix for this now. Can you let us know if you’re still encountering issues accessing the admin?

David_Arbias · April 1, 2026, 8:09am

I’m so sorry it seems I still have this problem:
Screenshot 1

Tried on both new firefox container, anonymous tab, and new window.

I also cleaned cache and cookies to see if there was some new version.

David_Arbias · April 3, 2026, 7:07am

I did some investigation and it seems the problem occurs because of navigator.sendBeacon. It seems there’s something messing with it and I get this error:

15:02:43.278 TypeError: navigator.sendBeacon is not a function
    beaconLog https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/context-slice-metrics-5ac3903546bf.js:14
    Ie https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/router-fe25bbdd8fd2.js:22
    gs https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:80
    b https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:80
    tue https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:80
    b https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/admin-context-router-4dc5b2cc08b5.js:2
    v https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:77
    p https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:77
    $1 https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:77
    resolve https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:77
    b https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/admin-context-router-4dc5b2cc08b5.js:2
    Tt https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/admin-context-router-4dc5b2cc08b5.js:2
    F1 https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:77
    _e https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:76
    Xe https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:76
    cn https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:76
    bt https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:76
    Qn https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:76
    SG https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/common-d78c9dfdef20.js:79
    push https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/EmbeddedApp-cdb81824d515.js:1
    Y https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/Navigation-c03a3d967a39.js:1
    oy https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    Tp https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    uee https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    Lu https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    JR https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    ld https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:23
    io https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    io https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    Ps https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    sR https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:23
    rR https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:23
    m https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:17
    a https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:17
    notify https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:17
    bw https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/render-common-e01dc4abe036.js:25
    notify https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:17
    s https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:17
    a https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:17
    b Redux
    O https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/useHostContext-b16b26ae45eb.js:21
    dispatch Redux
main-f62bd2a7621f.js:2:6845

Setting navigator.sendBeacon to an empty function magically fixes everything

David_Arbias · April 3, 2026, 7:31am

Hello the bug is that if you disable beacon for privacy reasons, it will break Shopify code:

I’ll fix it temporaly wiht tapermonkey

Muhammad_Hamza1 · April 9, 2026, 7:48am

This looks like a browser-specific issue rather than something wrong with your theme itself. From your description, Shopify is redirecting to the wrong URL path in Firefox (missing the /store/... part), which is why it ends up throwing a 500 error instead of loading the editor properly

I’ve seen similar problems before where the theme editor behaves differently depending on the browser. In many cases, it turns out to be a temporary bug, cache issue, or even a conflict with browser extensions—especially on Firefox.

A few things you can try:

Clear cache + cookies or test in private mode
Disable extensions (especially ad blockers or privacy tools)
Try Firefox troubleshoot mode
Test in another browser like Chrome to confirm it’s not store-specific

There have also been reports where Shopify editor issues appear suddenly across browsers due to platform updates or regressions and then get fixed later on

So most likely this is either a Shopify-side bug or a Firefox compatibility issue, not something caused by your theme. If it keeps happening, reporting it (like you did) is the right move

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