feat: optimize thunderbird for maillist

gui/awesome/rc.lua

@@ -765,6 +765,7 @@ awful.rules.rules = {
         -- and the name shown there might not match defined rules here.
         name = {
           "Event Tester",  -- xev.
+          "Message Filters",
         },
         role = {
           "AlarmWindow",  -- Thunderbird's calendar.

gui/thunderbird.md

@@ -17,3 +17,43 @@ Create new calendar -> On the Network
 
 1. [canada holidy](https://www.officeholidays.com/subscribe/canada)
 2. [chinese holiday](https://www.officeholidays.com/subscribe/china)
+
+
+# Style
+
+- Plain Text mail font too small: Preferences > Fonts > Advanced > set Font size for both `Latin` and `Other writing systems`
+- Enable `userChrome.css`: 
+  1. Preferences
+  2. scroll to bottom find Config Editor
+  3. search 'toolkit.legacyUserProfileCustomizations.stylesheets', set it to true
+- Make top message of thread bold
+  1. Menu > Help > More trouble shooting information
+  2. Profile Directory > Open Directory
+  3. Shutdown thunderbird
+  4. Create file 'chrome/userChrome.css' with following content:
+  ```
+    /*
+     * Do not remove the @namespace line -- it's required for correct functioning
+     */
+
+    @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+    /* set default namespace to XUL */
+
+    /*
+     * Collapsed read thread, but the thread contains unread , set text to bod black 
+     */
+    treechildren::-moz-tree-cell-text(container, closed, hasUnread, read) {
+        text-decoration: none !important;
+        font-weight:  bold !important;
+        color: #000000 !important;
+    }
+
+    /*
+     * If thread selected, revert to highlight text color
+     */
+    treechildren::-moz-tree-cell-text(container, closed, hasUnread, read, focus, selected),
+       treechildren::-moz-tree-cell-text(container, hasUnread, read, focus, selected) {
+        color: HighlightText !important;
+    }
+  ```