Index: PKGBUILD
===================================================================
--- PKGBUILD	(revision 412735)
+++ PKGBUILD	(working copy)
@@ -36,7 +36,8 @@
         distribution.ini
         mozconfig.cfg
         configure-fix-passing-system-bzip2-ldflags.patch
-        thunderbird-78.5-rust-1.48.patch)
+        thunderbird-78.5-rust-1.48.patch
+        metainfo.patch)
 validpgpkeys=(14F26682D0916CDD81E37B6D61B7B526D98F0353) # Mozilla Software Releases <release@mozilla.com>
 
 # Google API keys (see http://www.chromium.org/developers/how-tos/api-keys)
@@ -90,6 +91,8 @@
   install -Dm 644 ../vendor-prefs.js -t "$pkgdir/usr/lib/$pkgname/defaults/pref"
   install -Dm 644 ../distribution.ini -t "$pkgdir/usr/lib/$pkgname/distribution"
   install -Dm 644 ../thunderbird.desktop -t "$pkgdir/usr/share/applications"
+  install -Dm 644 comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml \
+    "$pkgdir/usr/share/metainfo/net.thunderbird.Thunderbird.appdata.xml"
 
   for i in 16 22 24 32 48 64 128 256; do
     install -Dm644 comm/mail/branding/thunderbird/default${i}.png \
@@ -207,6 +210,7 @@
             'e44fd608fb4975914479b4a1a5aa44e87f125564fb812fb46c0ee07d503dfdcdb444d7335efe90436caecc7be502aae6b558c585013ee924e618e6213988ae99'
             'e3ed2708b8354015cb3d2c81048d1ce4932d1effbe2b40efa7cf9b45c1b923b9fd708645e2f8aa0136a485a3f7ce6b396b85721aaf535a4a764fd5005fb7e222'
             'bbb8b0e7b9c67372eb22e1d6b6b5758fe504ded84c40a076d4a064374a1bf34ac12d5b514b328ac9ca984d976b9e0fbde81e68a66bec915c997d6be0c0917584'
+            '7e43b1f25827ddae615ad43fc1e11c6ba439d6c2049477dfe60e00188a70c0a76160c59a97cc01d1fd99c476f261c7cecb57628b5be48874be7cf991c22db290'
             'a9d10d6c8bbdd3df4c688e907f08a33cf376d955da0e5531b3cef0638e17b7d9058eae8e61f51fc35292c582f238cec02ebc8698416e34730f545d667875f16f'
             '8dc474a1e9c3cf54bc878723844d798b5aaf8f2d768986a8761d9767e6c67b95b33731b2e84931d144d6300ac2cdc239754ce2b12c340521318c0d4671c6ef85'
             '9e1349f2544ffd66d05729aa20b5ce1fbf7b7808eb2969668c9544988ff101d94701b186d14e72d1fd28d96394eb5ddcc0ae81ebe26a10d146a05c50bfc77199'
Index: metainfo.patch
===================================================================
--- metainfo.patch	(nonexistent)
+++ metainfo.patch	(working copy)
@@ -0,0 +1,11 @@
+diff -Naur thunderbird-78.9.1.orig/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml thunderbird-78.9.1/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml
+--- thunderbird-78.9.1.orig/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml	2021-04-17 02:05:05.808596043 +0000
++++ thunderbird-78.9.1/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml	2021-04-17 02:06:12.052455998 +0000
+@@ -1,6 +1,7 @@
+ <?xml version="1.0" encoding="UTF-8"?>
+ <component type="desktop-application">
+   <id>net.thunderbird.Thunderbird</id>
++  <launchable type="desktop-id">thunderbird.desktop</launchable>
+   <metadata_license>CC0-1.0</metadata_license>
+   <name>Thunderbird</name>
+   <summary>Thunderbird is a free and open source email, newsfeed, chat, and calendaring client</summary>