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I'm trying to install Thunderbird on a Macbook - macOS Tahoe 26.2 I've made a donation but Thunderbird won't download.

I did not get any error messages, in fact nothing happened.

[Note: I characterized this question as an "Installation and updates" issue (even though it is not per se about initial installation or updates) because moving a profile involves installation issues.]

Recently I moved my TB profile, for the second time in the past few months. This time I paid closer attention, and noted several things of interest (that may touch on some questions that remain undiagnosed in this forum):

1. TB took longer to start up, as it could find none of the folders cached in folderCache.json, so rebuilt the cache from the new profile location before starting. (I only learned about this from the next effect.)
2. The "Move to" "Recent" folders list was empty; this cached list only gets rebuilt from use (that is, from moving messages manually (not via filter) to destination folders). This effect led me to folderCache.json- and also may suggest why the OP in that question could not get resolution of his problem.
3. The newly cached folderCache.json was 528 KB, compared to 365 KB at the old location -- and that, in turn, was 170 KB larger than the 195 KB size of folderCache.json at the original location. So each time the cache is rebuilt it grows perhaps 150~200 KB (size depending on the many-times-repeated path length).

What causes the file growth? Because each time it is rebuilt, TB checks through all of the cached folder paths, apparently guided by the mailboxes listed in folderTree.json (see image below). [I think TB just checks each path to see whether it is compatible with the current profile location. If yes, the path is cached for runtime; if no, the path is repopulated from the current profile location (which takes most of the startup time).] But TB never deletes the no-longer-valid paths; it just appends to what was already in the file, so that the list of cached folder paths just grows (thereby increasing TB's startup time, every time). The best way to get rid of the old stuff is just to delete folderCache.json and let it rebuild on the next startup, to reduce the time needed for subsequent starts.

Finally, my questions: In addition to folderCache.json (different timestamp in each profile, of course), there are four files which are the same in all profiles: folderCache-x.json, x={1,2,3,4} (see screenshot). These are apparently from actions prior to the profile relocations, as they are simply copied from one profile to the next, unrelated to changes in folderCache.json. Can someone tell me:

1. What actions cause the creation of folderCache-x.json files?
2. Why folderCache.json merely appends new folder paths without deleting the old ones?
3. Why folder paths are specified explicitly (fully qualified) rather than relative to the profile path?

Thanks for any pointers.

When attempting install firefox on linux using the recommended install method (in order to use 1password fully i cannot install it via snap) the priority does not change from 500 to 1000 using the parameters described in the install guide. Here is an image showing my issue.

Hello Firefox team,

I downloaded firefox-142.0.tar.xz and copied the necessary files to the appropriate directories. Unfortunately, I am missing the 24x24 and 256x256 icons. Could you please add these resources?

I would be very grateful if you could help me with this.

Best regards Chris

I am getting stopped, dead cold, every time I try to install Thunderbird mail on Linux Mint 22. I've attached a generic article that explains how Akamai's site security services bots are working to protect a site or sites that TB must access to complete it's installation task. In my case it's Comcast/Xfinity. Accordingly, TB installations will not complete and new users are locked out...some for months. The concensus of the devs that have been working on this critical issue is that there is nothing on a new TB user's side that in any way causes or contributes to the issue. I would very much appreciate any information you can provide about a speedy resolution in the works.

Note: The error notification screen "Access Denied" is the same message I get, but with Xfinity referenced.

Thanks. Wiley Oregon, USA

link text

Hello Mozilla I have Windows 10 pro My last update of Thunderbird resulted in bad function, the former Installation worked not really fine. As I found out Windows showed me two Instances of thunderbird , the new one and an older 115.18.0 I tried to deinstall the old instance of thunderbird usind standard deinstall. This left me with some of the old thunderbird still in the sytem which I cannot deinstall. How can I get rid of these remainders to have a clean fresh installation of thunderbird?

Best Regards Wolfgang

I'm unsure if doing this will actually help me with a problem that I'm having, but I assume that it can't make it any worse, so my question is "Where can I download an (android) Firefox from?

For my puposes, I have the following requirements.

• My device has the Google play store (app), but I'd prefer to get a version of Firefox from a different location (because I doubt that what I want is in the Google play store). I know that Mozilla has sites that are specifically for hosting links to all of it's Firefoxes, so a link to one of those sub-sites would be ideal.
• The Firefox will need to be an ANDROID Firefox (because my device is an android tablet with an android OS).
• I don't know if Mozilla makes an (android) Firefox that is specifically for arm64-v8a android devices, but if they do, that would be preferred.
• EXTREMELY IMPORTANT = The Firefox will NEED to be able to use plugins. (I know that only some plugins will work in (android) Firefox.)
• I know that installing an (android) Firefox from anywhere except the Google play store (app) will mean that I'll (probably) need to manually visit the linked sub-site & get any updated versions from there. I accept that responsibility.

I am currently using (among other android web browsers) "Firefox beta", which I got from the Google play store a few days ago. I have a few logins (Google, Yahoo, & Facebook) already saved to that Firefox, but with Google, that was a pain in the (GUESS), & I'd prefer to avoid that if possible. Is there a way to "export" my (already installed) android Firefox beta's login information & then import that into a new side loaded (android) Firefox? If so, I'll need a link (or the instructions themselves) for how to do that.

Hi, Sorry to be a nuisance but I have tried all the suggestions to migrate T/bird complete and nothing works, I have been extremely careful that Thunderbird has been closed before making actions. It is a new and "empty" Win 11 25H2 machine.

The second Mozilla suggestion is impossible as my appdata/local folder has many files and is enormous, it does not seem to have a user name in the address either.

Any guidance would be greatly appreciated, or I will have to manually make a clone of Thunderbird with the email accounts and refer to the W10 machine for stored mail until these become too old to be of interest.

Sorry for the length of this request, But Please read to the end.

Please bear with me I'm 78 and not as sharp as I was. All I want to do is get back to my emails. I've been using Thunderbird for as long as I remember.

First, some background. For weeks now my computer has been telling me It needs more space to download updates. I throw out a few "Gigs" but it always wants more. My C:Drive, "110 GB solid state" is only for the Windows 10 operating system and a very small number of programs. Everything used to take up less than half the drive. All my personal work is on a separate drive. I've been saving for a new computer for a long time, still not there yet.

My Problem: I switched on my computer and it said Thunderbird had downloaded updates do I want to install them, yes. It twirled a bit but it never started Thunderbird, So, I tried starting it from the shortcut on desk top. But it said "It had been changed or moved" and no longer worked, neither would the one from the start column.

So I tried Re-installing Thunderbird. In the instructions it said download then press "Run". First it said I don't have permission to load it where it was before. It's my computer, I'm the only one here and I installed it here in 2010. (Program Files (x86)/Mozilla Thunderbird)

So I downloaded to "User" then it says "Finish installing".. How, there's no buttons and no mention of "Run". I'm completely stuck, can anybody help me ?? I've just realized without Thunderbird how can we communicate ??

  Norm

Mozilla has announced that:

> Beginning with Firefox 144, the minimum supported Android version will increase to 8.0 (Oreo)

Where can we download version 143 to install on older devices (Android 5 to 7) from now on?

Just bought a Chromebook and was surprised to find that only the phone version of Firefox is available for use on Chrome laptops. Any timeline for a laptop version of Firefox for Chrome?

Hallo Support, ich hatte eine ältere Version, leider ist diese durch Remote-Hilfe von Microsoft zur XBox verloren gegangen. Kann ich einen Link bekommen, so dass ich diese Version wieder installieren kann da ich mit der aktuellen Version dies nicht ereichen kann. Mir freundlichen Grüßen Wolfgang Fischer Mail-Adresse awfisch@t-online.de