Firefox / Plasma browser integration

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Introduction

According to the upstream documentation above, a gentoo user would need to install both:
- the addon from: https://addons.mozilla.org/en-US/firefox/addon/plasma-integration/
- the gentoo package: kde-plasma/plasma-browser-integration

The current addon version is: 1.8.1, last updated Oct 27, 2021.
The current gentoo plasma-browser-integration package version is: 5.27.5

We do not find a way to correlate the version of the addon 1.8.1 to the current version of plasma 5.27.5.

A warning in the Firefox console:

InstallTrigger is deprecated and will be removed in the future. constants.js:50:14

has already been fixed upstream:
https://invent.kde.org/plasma/plasma-browser-integration/-/commit/dfa12f...
However the addon has not been updated since.
Already reported upstream:
Bug 455920 Replace InstallTrigger Firefox check
https://bugs.kde.org/show_bug.cgi?id=455920

List of bugs upstream:
https://bugs.kde.org/buglist.cgi?list_id=1517340&order=changeddate DESC%2Cbug_status%2Cpriority%2Cassigned_to%2Cbug_id&product=plasma-browser-integration&query_format=advanced&resolution=---