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I am currently running Thunderbird version 128.11.0esr on Windows 11 on a Dell desktop computer.

I have been running Thunderbird for years. But back in February 2025 my previous Dell desktop died, so had to purchase a new Dell desktop running Windows 11. Then I downloaded Thunderbird and installed it on the new desktop then copied over the profiles that fortunately had been backed up just a week prior. It has been working fine. (When I installed the Thunderbird on the new computer I did not realize there was a difference between ESR (Extended Support Release) channel and Release channel; I just downloaded and installed what I came upon.)

However, around 5/28/25 got a pop-up message that stated something to the effect it is recommended I upgrade to Thunderbird Release.

Should I download and install a new Thunderbird from the Release channel? Will the existing profiles work with the Release channel Thunderbird? Thank you for your help.

Your updates and those of Windows 11, keep returning my software to each company's default settings. I have Glaucoma. During one of my surgeries, the lens on my eyes were replaced with artificial ones. Now, I have perfect long-distance vision, but I have difficulty seeing anything closer than 24-18 inches. I bought a 17-inch laptop and adjusted all the visual and light settings so that I can see my screen without reading glasses. When I stand and start walking while wearing my reading glasses, I run into things and fall.

Being able to adjust the size of icons, text in toolbars, text on the screen, etc, has made my life easier and allowed me to continue using my computer. Each one of those visual assists, however, requires a different change to default settings in the software. Recently, an update changed the speed of the cursor causing me to hit inaccurate selections. Now, I have to find settings to change that. I am 76 years old, and I have too many new things that I want to learn, to spend hours after an update resetting my personal changes in the default settings.

I am sending this same message to the MS Windows team.

pages don't load due to old MAC osx yosemite 10.10.5 downloaded Firefox 115.24.0esr but don't know what to do when wavy arrow from firefox icon to App icon image appearsScreen Shot 2025-06-04 at 02.47.08

I normally use Fedora but my Fedora machine died yesterday. For a time being I want to use Thunderbird on my Mac.

I have a backup of my thunderbird profile directory from Fedora 42. This corresponds to thunderbird-128.8.0. On the other hand, the current version on the mac is thunderbird-138.0.2.

1. Since the version number is higher on the mac I think I will be able to use the old 128.8.0 profile with the new mac version ?

2. If I do this, I will not be able to transfer my profile back to Fedora when I get it working again (because the version number there is lower) ?

3. Is there a way from me to install thunderbird-128.8.0 on the Mac so that I will be able to transfer my profile back to Fedora ?

Yesterday (Sat 5/31), I woke up to the 139.0.1 update, along with a new behavior that Firefox will hang (and require a Force Quit) any time I click a pinned extension that opens a drop-down interface (e.g. 1Password, Adblock Plus, Pocket).

I've tried disabling all extensions and bringing single ones back (as well as disabling Pocket via about:config) - the result: any extension that opens a dropdown causes the hang, and any extension that runs without opening a dropdown works just fine, regardless of the combination of extensions that are enabled/disabled at the time.

I tried opening Troubleshoot Mode (although it's of little use since my problem seems rooted in extension behavior) - the first several times I tried, it ALSO caused a hang, but now I'm able to turn it on & off without an issue (though the page rendering is wonky within it - I imagine that's just a Troubleshoot Mode thing?). For whatever it's worth, I think the change that preceded it starting to open without hanging was my disabling this [setting] (though it didn't cause any change in the original behavior, which was my initial goal).

I'm running macOS 14.6.1 if it's of any use. Thanks for any troubleshooting ideas!