I have been on the internet ever since it became public in the 90s. I was in my fifties at the time. My first website was done in html - all that was available at the time. A page blue background and simple Arial font. No pictures.
I have been a user of Mozilla creations from Netscape to Firefox and definitely Thunderbird for email. I was a happy camper.
It all came apart 6 or 7 months ago when an update to my Thunderbird made all the pages so large that I couldn't use the site. I'm on Linux so I tried several email apps. They worked - but they reminded me of those early days of screens with blue backgrounds and Arial text. Then came Thunderbird 115 and I thought I'd give it a try. I had and still have lots of problems with the software. I have been helped by a top 10 contributor who did everything he could for me, but there are parts of the program that simply do not work for me.
I am in my 80s now and I have, not just aging vision, but macular degeneration. Needless to say, I need my text large. The minimum size I can see is 14pt.
Guess what size font my incoming emails have? 6pt! Even for people with normal vision, 6pt text is a hard read. My top ten contributor stayed with me while guiding me through the process of setting my fonts. But we went through a number of pitfalls. 1) Apparently the menu at the top of the Linux screen is different from a Windows screen and probably a Mac screen? Why? Why aren't the menus uniform across computer systems? Why(on Linux) are font issues found in Edit>Settings, View>Font Size, View>Zoom and also in "Hamburger Menu" at the top right of the Thunderbird Header.
My Mentor assured me that the font problem had been fixed and gave me a detailed (with images) path to set my fonts. It didn't work and I also sent images to show 1) that I had followed his instructions and 2) with an image of an email, showed him that there was no change in my incoming emails. Now, I have found that I can use Cntl++ to enlarge the type in my incoming emails. However, the enlargement is not permanent. If I want to read my next email, I have to use Cntl-- in the previous incoming email so that I can use Cntl++ on the next email. THIS IS CRAZY. Does no one see that this is crazy?
Please, this needs to be fixed
See a sample incoming email below
Config Editor https://support.mozilla.org/en-US/kb/config-editor
Search preference name layout.css.devPixelsPerPx