theme font and size changer is not listed under appearance but listed under extensions. I do not see it on tools menu and is not working. It is not visible
theme font & size changer not visible anywhere in tools menu. toolbar or anywhere. have no control of it.
Izabrano rješenje
To install a downloaded add on file go to the Add-on tab and click Extensions. Click the gear icon and select Install from File.
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Remove the changer add-on you have and install the one from this page:
https://addons.mozilla.org/en-us/thunderbird/addon/theme-font-size-changer-fixed/
To install, drag the Download Now button and drop it onto Tools/Add-ons/Extensions in TB.
drag the Download Now button and drop it onto Tools/Add-ons/Extensions in TB. it wont work, and when i tried to download by clicking on it, run, adobe message comes up: adobe couldn't' open this file etc., etc.,
Odabrano rješenje
To install a downloaded add on file go to the Add-on tab and click Extensions. Click the gear icon and select Install from File.