From be90a00e37b64dc84067aac8abc707dc782d7b25 Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Sat, 22 Nov 2025 19:01:03 +0200
Subject: [PATCH] feat: add LibreWolf browser detection  (#578)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>
---
 src/constants.js                     |  2 ++
 src/parser-browsers.js               | 15 +++++++++++++++
 test/acceptance/useragentstrings.yml | 14 ++++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/src/constants.js b/src/constants.js
index 9f3d205..5fbc37d 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -26,6 +26,7 @@ export const BROWSER_ALIASES_MAP = {
   'Internet Explorer': 'ie',
   InternetArchiveCrawler: 'internetarchivecrawler',
   'K-Meleon': 'k_meleon',
+  LibreWolf: 'librewolf',
   Maxthon: 'maxthon',
   'Meta-ExternalAds': 'meta_externalads',
   'Meta-ExternalAgent': 'meta_externalagent',
@@ -92,6 +93,7 @@ export const BROWSER_MAP = {
   ie: 'Internet Explorer',
   internetarchivecrawler: 'InternetArchiveCrawler',
   k_meleon: 'K-Meleon',
+  librewolf: 'LibreWolf',
   maxthon: 'Maxthon',
   meta_externalads: 'Meta-ExternalAds',
   meta_externalagent: 'Meta-ExternalAgent',
diff --git a/src/parser-browsers.js b/src/parser-browsers.js
index 621bbb9..4167be8 100644
--- a/src/parser-browsers.js
+++ b/src/parser-browsers.js
@@ -892,6 +892,21 @@ const browsersList = [
       return browser;
     },
   },
+  {
+    test: [/librewolf/i],
+    describe(ua) {
+      const browser = {
+        name: 'LibreWolf',
+      };
+      const version = Utils.getFirstMatch(/(?:librewolf)[\s/](\d+(\.?_?\d+)+)/i, ua);
+
+      if (version) {
+        browser.version = version;
+      }
+
+      return browser;
+    },
+  },
   {
     test: [/firefox|iceweasel|fxios/i],
     describe(ua) {
diff --git a/test/acceptance/useragentstrings.yml b/test/acceptance/useragentstrings.yml
index 0f41035..187edd9 100644
--- a/test/acceptance/useragentstrings.yml
+++ b/test/acceptance/useragentstrings.yml
@@ -1915,6 +1915,20 @@
         engine:
           name: "WebKit"
           version: "605.1.15"
+  LibreWolf:
+    -
+      ua: "Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 LibreWolf/124.0.2"
+      spec:
+        browser:
+          name: "LibreWolf"
+          version: "124.0.2"
+        os:
+          name: "Linux"
+        platform:
+          type: "desktop"
+        engine:
+          name: "Gecko"
+          version: "20100101"
   SeaMonkey:
     -
       ua: "Mozilla/5.0 (Windows NT 5.2; rv:10.0.1) Gecko/20100101 Firefox/10.0.1 SeaMonkey/2.7.1"