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How in the heck do you increase the size of the UI font? I have a 1440P monitor and the TINY size of the UI font makes it nearly impossible to read the text on the menu buttons, I have lean forward and squint to read it because they are so damn small. I can't find anything in the settings to make the UI text larger. It is as if some dummy hard coded the UI font size so it's impossible for the average person to find out how to change it. It makes no sense whatsoever.

And please don't tell me to increase the zoom in the Windows settings, because that screws up EVERYTHING else...

Another thing that is driving me crazy is how do you set it so that scrolling with the mouse wheel is smooth and not jerky? When i scroll with the mouse wheel, instead of smoothly moving the page up or down, it JERKS a couple of lines at a time. This is the only browser that it does that in. I have smooth scrolling ON in the mouse settings on my computer but for some reason, only Firefox is doing this.

Hello, I have added quite a number of bookmarks to my Firefox app on my iPad. I’m set up for syncing to my iPhone. I’ve tapped sync now on my iPhone and on the iPad, but only a few of the bookmarks have synced to the iPhone. I’ve also shut down and rebooted both devices. Both are signed in via email and set up for syncing, so I’m at a loss as to what to do next. Does it just take time? Any advice? Thank you.

Recently transferred from Chrome. My understanding was Firefox private browsing was supposed to work similarly to chrome incognito mode; once you close the browser, all local files are deleted and cookies are cleared.

However, with Firefox it maintains my logins. If I log into an account while private browsing and the close the browser, I’ll still be logged in next time I go to the website even if it’s days later (and I have never logged into this account in a non-private browsing window!)

I never had this issue using chrome incognito, so it seems to be a Firefox problem.

Is this just not something Firefox supports? Is there any way to prevent storage of cookies and private data?

We been using Thunderbird for over 20 years and used MozBackup while it was supported and used it a few times when something got corrupted. To migrate from one PC to a new PC, we always used the "manual method" described below. As our files are 10.2 GB (mine) and 6.4 GBMB(wife's) in size, that goes like this:

If your profile folder is larger than 2 GB, you need to use your file manager and create a backup copy of your profile folder yourself.

1. To find your profile folder, you can use the Open profile folder link in the first step of the Export tool. You will see the contents of your profile folder in your file manager. The profile folder has a name like abc12defg.default-release. 2. Select and copy the entire content (content only, not the folder) of your profile folder. 3. Create an empty folder where you want to keep your backup, e.g. on a USB flash drive. You can choose a helpful folder name like Thunderbird_profile_backup_2022-06-28. 4. Paste the contents of your profile folder into your empty target folder.

On the larger 10.2 GB filetransfer, after launching TB on the new machine there was a lot of the spinning circle icon appearing / disappearing ... then it just stopped, gave it some time. Rebooted and all was fine with the world. Most accounts were accessible, one was not and I copied that from the desktop open on the same desk.

With the 6.4 GB file transfer to wife's laptop, it did not work ... tried again, no luck.

Tried my 10.2 GB file on wife's laptop and it worked fine. Can't understand why, after each attempt TB was uninstalled and everything TB related was removed from roaming folder. System was rebooted, searched for anything TB related, rebooted, installed TB, closed it, copied folder contents into profile folder on laptop, Rebooted and no go.

It will take the 10.2 GB file but not the 6.4 ... I'm confused.

Why Mozilla don't have download manager like mozilla PC We need it cuz the application use the phone download manager and it's trash if click in download its stop Exit from it stop and its very slow really snail We need it application is perfect why don't have this future

Pls do it 🙏🥺

How is this supposed to work? I am hoping to have a couple of folders from my IMAP configured email account automatically synchronized to LOCAL FOLDERS. But under the 'Synchronization' tab there are not a lot of options, and really only a 'download' button. But does that really synchronize? prevent duplicates? Someone smarter than me, please advise? Thanks in advance John

I like to setup a bulk email where it would make send. Is there way I can add all emails in the collection address without having to go to all of them.

i attached the address book. So when I open a new message. How can I ensure all collected address are grabbed to the BCC field?

In the new 140.0.1esr eclipse version the menu bar has lost Tools. When I right click and go to "Customize toolbar" there is not an option to add either 'Tools' or 'Message Filters', the later being what I would prefer to add to the tool bar (see attached image). I now have to click the hamburger icon -> select Tools -> Message Filters. If I could add 'Tools' or 'Message Filters' into the menu bar (for Mail messages since there are segregated menu bars now) it would be so much easier. I use the Message Filters function frequently so having to go through several steps to get to it now is very inconvenient in this new version.

When I change a setting in TB it doesn't save it and reverts to old settings on restart. There is no "Save" button on the settings screen. I have looked for the Prefs.js file in the Profile folder to see if it's read only but it doesn't exist. I have checked that hidden files are not hidden in the explorer view setting. I have searched my entire c drive for prefs.js and the only ones there are in the Firefox profile folder. I have looked for any .js, .json files that resemble anything to do with preferences or configurations and see none. All the advice I can find on Google has been exhausted. Help!!

T B 128.12 The Window which shows saved passwords is TOO SMALL. Cannot see the full entries. Also, the little 2 sided window to expand the entry does NOT work. As it is, it is practically useless.

I was forced to erase my PC because it was infected with malware. I saved my Tbird profile to my HDD before erasing. I pasted the saved profile to %Appdata% >Thunderbird, copying 1,777 items. When I brought up Tbird, I got the Account Setup window, so I don't think the profile was actually there. What did I do wrong?

Keep getting this message: "The folder "inbox on [email address]' could not be compacted because writing to folder failed. Verify that you have enough disk space, and that you have write privileges to the file system, then try again."

I have tons of space, but I don't know which folder you are referring me to. Does it have a name? Does it reside in a specific subfolder? Can you give me some hints to locate the folder? Is this really the problem, or does the message indicate something else is amiss.

Thanks, Don

Is there a font setting to change JUST the font size (event title field) that is displayed on the TB Calendar monthly grid view. Was able to change overall size in TB, but did not really want same change on mail views? Perhaps a specific TB setting (or userchrome command)?

Yes, I did see the question on Calendar Event font size changes, but not applicable to this as I read it...

Thanks for any suggestions, if any....

I have used the same reply header (set up using Config Editor, IIRC) for so many years that I have forgotten the syntax - which should not be a problem, except that I cannot find it anywhere - certainly not in Help. Can someone direct me to the reply header syntax description?

Is there away i can get my browser history and data back ,i logged out of windows couldnt remember my password ,logged in with a new password and all my data is gone .....

I am using the latest Fiefox and i have disabled all adons i have tried everything I have changed my Facebook password every time i g try to share something on Firefox get a black box on the bottom right that says something wrong . I have tried to copy the entire hing but can not i got some of it I have even reinstalled firebox ans still can not share anything I have tried contacting Facebook but that does not happen no response i appears to work in Chrome on a noter Facebook account so it is Firefox. i will send you what i could get on the screen shot the part that is missing s the part that says something s wrong

From: cartwrm@talktalk.net <cartwrm@talktalk.net> Sent: Friday, July 18, 2025 2:14 PM To: no-reply@mozilla.org <no-reply@mozilla.org> Subject: Re: Bradforth posted an answer to your question "Ive lost mybookmarks on the left side of the screen"

It's really strange (I'm still trying to understand my relatively new Windows 11 laptop), bookmarks have been where I'd expect them for a few days, then this morning, it's as if Firefox has done some sort of clean/re-arrangement. The bookmarks had disappeared and there wasn't my usual array of sites available along the top. Then by clicking on a few things on the right (Firefox) 'most used' re-appeared, then later the toolbar is there on the right, I'd really like it back on the left And also I'd love to know whether I might have done something unconsciously which caused this.

Mike

Hello, FF support forum,

I think I have seen a Container retain my login to a site when I open it again after closing it. Is there a way to configure Containers so that they are mini versions of the dump-cookies-temp-data when I close Firefox entirely? I would so love that functionality.

Regards, G.W.