Thunderbird is my favourite email client in Linux. But on an 2013 MacBook Pro, using it became a pain.
Stop Crazy CPU Usage
Due to some internal problems, my thunderbird CPU usage went up to 40% during idle time. Found this solution and worked:
https://rainbow.chard.org/2013/02/19/thunderbird-high-cpu/ and https://www.reddit.com/r/Thunderbird/comments/49ur6w/finally_got_thunderbird_to_stop_freezing_and/
Open "Preferences" > "General" > "Config Editor...", set mail.db.idle_limit from 300000 to 300000000.
Open "Preferences" > "General", turn off indexing service.
Set the Default Sort Order
Open "Preferences" > "General" > "Config Editor..." again.
If you wanted to sort all mail by Thread, Descending (newest at top), the preferences in the config editor will look like this:
mailnews.default_sort_order: default integer 2
mailnews.default_sort_type: default integer 22
Change the Font Size
This works on Thunderbird 78.4.0.
First, go to "Help" > "Troubleshooting Information", click the button "Show in Finder" next to "Profile Folder". It will open the profiles folder.
Find the folder named xxxxxx.default-release, create a new folder chrome along side with the Mail folder.
Inside the chrome folder, create a file 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 font size in folder pane */
#folderTree >treechildren::-moz-tree-cell-text {
font-size: 1.2rem !important; /* You can also use em, pt or other units here.*/
}
/* Set font size in thread pane */
#threadTree >treechildren::-moz-tree-cell-text {
font-size: 1.2rem !important;
}
/* Set height for cells in folder pane */
#folderTree >treechildren::-moz-tree-row {
height: 22px !important;
}
/* Set height for cells in thread pane */
#threadTree >treechildren::-moz-tree-row {
height: 22px !important;
}
This code is from https://superuser.com/questions/175135/how-can-i-change-the-font-size-of-a-thunderbird-thread-list-on-a-mac, modified a little to suit my need.
Next, you need to open "Preferences" > "General" > "Config Editor...", accept the warning dialog.
Search for toolkit.legacyUserProfileCustomizations.stylesheets and double click it to set its value to true.
Finally, restart your Thunderbird.
More readings:
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