Bug 508616

Summary: `about:debugging` reports "An unexpected property was found in the WebExtension manifest" for `plasma_integration-1.9.1.xpi`
Product: [Plasma] plasma-browser-integration Reporter: Roke Julian Lockhart Beedell <4wy78uwh>
Component: FirefoxAssignee: Kai Uwe Broulik <kde>
Status: REPORTED ---    
Severity: minor    
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: A Confirmative Screenshot

Description Roke Julian Lockhart Beedell 2025-08-22 18:29:01 UTC 
Created attachment 184359 [details]
A Confirmative Screenshot

# SUMMARY

When https://addons.mozilla.org/firefox/downloads/file/4298512/plasma_integration-1.9.1.xpi is enabled in `firefox-142.0-1.fc42.x86_64.rpm`, `/html/body/div/div/main/article/section[2]/div/ul/li[10]/section/section/aside/div/details/p` of about:debugging#/runtime/this-firefox:~:text=Reading%20manifest:%20Warning%20processing%20key:%20An%20unexpected%20property%20was%20found%20in%20the%20WebExtension%20manifest reports:

> Reading manifest: Warning processing key: An unexpected property was found in the WebExtension manifest.

# STEPS TO REPRODUCE

~~~sh
#!/usr/bin/env sh
sudo dnf5 --refresh install firefox-142.0-1.fc42.x86_64 -y && \
firefox 'https://addons.mozilla.org/firefox/downloads/file/4298512/plasma_integration-1.9.1.xpi'
firefox --new-tab 'about:debugging#/runtime/this-firefox:~:text=Reading%20manifest:%20Warning%20processing%20key:%20An%20unexpected%20property%20was%20found%20in%20the%20WebExtension%20manifest'
~~~

# OBSERVED RESULT

> Reading manifest: Warning processing key: An unexpected property was found in the WebExtension manifest.

# EXPECTED RESULT

This warning shouldn't be displayed. It isn't for any others.

# SOFTWARE/OS VERSIONS

> ~~~
> Operating System: Fedora Linux 42
> KDE Plasma Version: 6.4.4
> KDE Frameworks Version: 6.17.0
> Qt Version: 6.9.1
> Kernel Version: 6.15.10-200.fc42.x86_64 (64-bit)
> Graphics Platform: Wayland
> Graphics Processor: AMD Radeon 780M Graphics
> Manufacturer: Framework
> Product Name: Laptop 16 (AMD Ryzen 7040 Series)
> System Version: A7
> ~~~

# ADDITIONAL INFORMATION

Ascertained whilst debugging https://bugzilla.mozilla.org/show_bug.cgi?id=1984438#c4:~:text=2025%2D08%2D22%2018:25%20UTC-,%23c1,-This%20recurs%20even.