Permission denied to access property "contains"

Hi! When I press on the down pointing arrow beside Install button for gImageReader or any other program to install I get the following error:

You have encountered an error

Error: Permission denied to access property "contains"

37823/X<@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:372272 div@unknown:0:0 w@https://flathub.org/_next/static/chunks/pages/apps/%5BappId%5D-5a79906bf0df594d.js:1:7503 div@unknown:0:0 header@unknown:0:0 L@https://flathub.org/_next/static/chunks/pages/apps/%5BappId%5D-5a79906bf0df594d.js:1:10769 div@unknown:0:0 eT@https://flathub.org/_next/static/chunks/pages/apps/%5BappId%5D-5a79906bf0df594d.js:1:47018 tt@https://flathub.org/_next/static/chunks/pages/apps/%5BappId%5D-5a79906bf0df594d.js:1:65066 main@unknown:0:0 div@unknown:0:0 eV@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:429328 d@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:16:99136 s@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:16:42718 tr@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:431973 m@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:4:27911 c@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:4:27806 c@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:392007 41591/td<@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:433075 X@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:23111 31196/tn/<@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:73750 e8@https://flathub.org/_next/static/chunks/pages/_app-2dab43fde1998de6.js:6:430039 errorBoundary(unknown)@unknown:0:0 p@https://flathub.org/_next/static/chunks/main-ca36080034c50102.js:1:95164 q@https://flathub.org/_next/static/chunks/main-ca36080034c50102.js:1:40913 Y@https://flathub.org/_next/static/chunks/main-ca36080034c50102.js:1:42689 ea@https://flathub.org/_next/static/chunks/main-ca36080034c50102.js:1:45891

I’ve tried rebooting Firefox and clearing its cache - none of this helped. Although it’s worth to mention that Install button by itself works perfectly, and I can download flatpakref files and use them to install what I need, actually.

Looking at program screenshots also fails: if I click on them I get the same error AFAIS.

I’m using Xubuntu 24.04.1 LTS and Firefox 134.0.1 (64-bit).

can you try without browser extensions?