Native Messaging in LibreWolf

I’ve tried following this guide as well as installing extra/plasma-browser-integration and aur/librewolf-extension-plasma-integration, but no matter what I do, I cannot get native messaging working in my librewolf, which is installed via aur/librewolf-bin.

For example, with the plasma browser extension, I get the following error, despite the following being in $HOME/.librewolf/native-messaging-hosts/org.kde.plasma.browser_integration.json and /usr/lib/librewolf/native-messaging-hosts/org.kde.plasma.browser_integration.json:

{
  "name": "org.kde.plasma.browser_integration",
  "description": "Native connector for KDE Plasma",
  "path": "/usr/bin/plasma-browser-integration-host",
  "type": "stdio",
  "allowed_extensions": ["plasma-browser-integration@kde.org"]
}

Does the json need to be somewhere else? Is something wrong with my librewolf install? Every single instance of someone with the same issue ends with them solving it by putting in the browser integration json, so I don’t know what’s going wrong here.

I created a new profile with just the plasma integration extension and it worked, so I gradually copied over files from my profile into the testing one, restarting without and then with addons if plugins or searches werent working. I found prefs.js was the file causing the issue, so I made a profile with everything except it, and began configuring my settings, toolbars, extensions, etc to be identical to my normal profile, and making the few about:config tweaks I had for chrome.css capability and native file picker.

Here’s a diff of the pref.js files, but there are a lot of potential causes in here I’d imagine:

--- /home/laura/prefs working.js	2025-03-05 14:09:26.372597348 +0000
+++ "/home/laura/prefs not working.js"	2025-03-05 09:33:34.901129745 +0000
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-user_pref("browser.download.viewableInternally.previousHandler.alwaysAskBeforeHandling.webp", true);
-user_pref("browser.download.viewableInternally.previousHandler.preferredAction.avif", 0);
-user_pref("browser.download.viewableInternally.previousHandler.preferredAction.webp", 0);
+user_pref("browser.download.panel.shown", true);
+user_pref("browser.download.save_converter_index", 1);
+user_pref("browser.eme.ui.firstContentShown", true);
+user_pref("browser.engagement.fxa-toolbar-menu-button.has-used", true);
+user_pref("browser.engagement.library-button.has-used", true);
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+user_pref("browser.firefox-view.view-count", 4);
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+user_pref("browser.migration.version", 150);
+user_pref("browser.ml.chat.enabled", true);
+user_pref("browser.newtabpage.activity-stream.impressionId", "{3e22693c-8dd8-43d8-81b8-e0fe35f786d4}");
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Hope this helps anyone with the same issue.

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