I checked settings, and this is what it shows
QuoteDefault browser
Make Google Chrome the default browser MAKE DEFAULT
and the odd thing is only Sparky shows the settings with a clickable icon on the far right that says "MAKE DEFAULT"
Here's a strange output from sparky:
$ xdg-settings get default-web-browser
vim.desktop
and from Xubuntu:
$ xdg-settings get default-web-browser
google-chrome.desktop
If you would like to set your favorite web browser as a default one, run:
sudo update-alternatives --config x-www-browser
$ update-alternatives --get-selections
...
x-www-browser auto /usr/bin/google-chrome-stable
Whatever I did previously must have set chrome as default.
Thanks for reply.