Re: Some applications don't follow default browser settings

[Max Nikulin <manikulin@gmail.com>]

On 04/10/2022 11:07, Tianyu Chen wrote:
> I'm using Google Chrome (/opt/google/chrome/google-chrome) as my default 
> browser, which is set by `update-alternatives` command. However my 
> firefox-esr is always launching when links are opened in Telegram and 
> Mozilla Thunderbird.

Almost certainly Thunderbird ignores alternatives, mailcap and queries 
XDG settings from mimeapps.list, mimeinfo.cache files

>      $ xdg-settings get default-web-browser
>      google-chrome.desktop

xdg-mime query default x-scheme-handler/http
xdg-mime query default x-scheme-handler/https

or
xdg-settings get default-url-scheme-handler http
that likely invokes xdg-mime

>      $ cat ~/.config/mimeapps.list
>      [Default Applications]
>      x-scheme-handler/tg=userapp-Telegram Desktop-ZS5OS1.desktop
>      text/html=google-chrome.desktop

My guess is that when applications are going to open a link, MIME type 
is not known yet, so scheme handler is queried. Likely you miss the 
following associations in the [Default Applications] section:

x-scheme-handler/http=google-chrome.desktop;
x-scheme-handler/https=google-chrome.desktop;

Do not forget to run update-desktop-database with a proper directory as 
its argument.