how to change message display font size for version 45.3
I'm not sure what previous version of Thunderbird I had, but I had the theme changer and font size add-on that allowed me to change the font size in the message display pain. I downloaded and tried installing the add-on for version 45.3 but nothing appears in the toolbar, so I can't change the font size...if it's not available for 45.3 can I go back to a previous version of Thunderbird?
Chosen solution
On the toolbar 
then 
Remove theme and font size changer.
use the search box in the top right to search for the theme and font size changer. Typing font should be enough o locate it.
reinstall it.
Better?
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Chosen Solution
On the toolbar then
Remove theme and font size changer.
use the search box in the top right to search for the theme and font size changer. Typing font should be enough o locate it.
reinstall it.
Better?
Matt - thanks so much for the help! That's exactly what I ended up doing and it solved the problem....don't know how or why it disappeared yesterday (the font size had changed to really small) , but I now have it back and it's working. Thanks again!!
I think a bad update for the add-on.... it shows 13 September on it's download page.