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I am trying to disable the text segmentation behavior in latest Firefox(v151), but I have encountered an issue where changing the preference in [about:config] does not seem to have any effect.

Details:

   Target Preference:  intl.icu4x.segmenter.enabled
   Current Setting:       false

   Problem: 
   Even after setting this to false (and restarting the browser), the text segmentation behavior (such as word selection logic) remains unchanged and appears to still be using the ICU4X engine.

   Reference:
   https://support.mozilla.org/en-US/questions/1440483#answer-1638092

I would like to know:

  1.  Has this preference been deprecated or hardcoded to true in recent versions of Firefox?

   2. Is there any other way to disable the ICU4X-based segmenter or revert to the previous segmentation logic?

   3. If this is a known change, is there an alternative preference to adjust how word selection handles specific languages (e.g., Japanese)?

I am using the latest version of Firefox. Any insights or workarounds would be greatly appreciated. Thank you in advance for your help!

Thunderbird 153 in Linux Mint 22.1 XFCE.

I use Waterfox installed via flatpak as my default browser. Unfortunately Thunderbird's Oauth2 verification pages don't open correctly in that browser, due to some of the browser add-ons I have installed in Waterfox.

I also have Firefox and Chromium installed. I want Thunderbird to always ask which browser to use before it opens a link. I followed instructions I found in multiple places on the internet:

• Open config editor
• Set network.protocol-handler.warn-external.http and network.protocol-handler.warn-external.https to true
• Restart Thunderbird
• Click a https (or http) link in an email: Waterfox opens
• Settings-General-Files & Attachments: There is now an Action dropdown for https (or http) with options 'Always ask', 'Use Web Browser (default)', 'Use other...' and 'Delete Action'. The current selection is 'Use Web Browser (default).
• Change Action to 'Always ask'
• Restart Thunderbird
• Click a https (or http) link in an email: Waterfox opens again, even though 'Always ask' is still the selected action.
• Restart Thunderbird.
• Settings-General-Files&Attachments: The https (or http) action has now changed back to 'Use Web Browser (default)'

How do I get Thunderbird 153 to ask which browser to open for a web link?

If you are using the release level of 153, and prefer not to see the Thundermail menu entry, do these two things:

Add this statement to the userControl.css file: /* ##### Stop display of Thundermail menu item. */ @media not -moz-pref("mail.accounthub.thundermail.enabled") {

 #tbpro-menu-id-root { 
   display: none; 
 } 

}

Set this entry in Config Editor to FALSE: mail.accounthub.thundermail.enabled

I had to reinstall everything after a Windows glitch. I always liked to have Thunderbird show a list of my emails with a window below to show the content of emails I selected in the list. But now I can't find anything in settings to allow me to do that.

I am on 140.7.1esr (64-bit). My sub-folders under Inbox is not sorted alphabetically. I do not see any option to re-sort at the pop-up menu after I right-click at the account name. Does this mean the version I am on does not have this feature?

Hello,

I'm looking to customize the colour of the message header row (the part highlighted in red; with a black background as shown in the screenshot) to #202020, to match the rest of the elements of the view. While I've successfully managed to customize other elements (code below), I need help with identifying what to specify for the message header row.

.tree-table { background-color: #202020 !important; }

treechildren { background-color: #202020 !important; }

#messagePane { background-color: #202020 !important; }

#messageHeader { background-color: #202020 !important; }

#msgHeaderView { background-color: #202020 !important; }

Thanks and cheers.

Please tell me how to clear cache in the Firefox focus browser on my iPhone. It says to go to settings, then to data management but I don’t see data management under my settings. Please explain how to do this. Thanks, Linda

I exported my settings from desktop thunderbird when setting up Thunderbird Android 20 but discovered it was automatically marking messages as read. That makes it difficult to have a peek at messages when I'm out (in case there's something urgent) but still see those messages as unread when I return to the desktop.

https://support.mozilla.org/en-US/questions/1504592 claims to have found the option to do that, but it's an old message that has been archived without ever saying where that option was found. I've tried settings search as well as a visual search of all settings without seeing a relevant option.

Does that option actually exist? Or do I have to go back to K9 (which, at least in v19, had that option)?

In the email address tree on the start up page of Thunderbird, how can I manually sort the email address order? I have an address I would like to move to the top of the list.

I know it can be done, but I can not for the life of me remember how. Please help.....

I've read a lot of suggestions on the FAQ section, but what they are offering, I do not have listed in/on my Thunderbird.

Thank you.

On my Samsung A05 Thunderbird does not show received email dates only the day. This is useless for finding emails going back more than a week or two. I don't care what day of the week it was received, just the date and time. Earlier solution offered (via message lists) not in any of my menus so cannot use. Please advise how to show dates. Current OS Android 15 A055FXXSHDZF1/ A055FOJMHDZF1 / A055FXXSHDZF1 with security patch level: 5 June 2026 Also cannot find support/about option in the settings menu to show the Thunderbird version.

Please add an UNDO feature to the Android version.

It has happened to me multiple times that when trying to scroll (esp in the bus) it registers as a swipe & deletes a message.

and then it's really hard to scan the trash to figure out which message it was

at the same time, i don't want to be asked for confirmation *every* time i delete something - I'll spend as much time "confirming" as deleting messages.

So the ideal in an undo button somewhere in the interface where a can undo the last action (from a subset, since I'm guessing not every action can be undone). The desktop version has it, hopefully it can be migrated to the android version.

thank you

Alvar

Hi,

I use Thunderbird 152.0.1 (64-Bit) and I only have three items in the files & attachment section of general settings (JPG, PDF, Excel). How can I add more items, for other file types? Is there an easy way to do this or does this mean I have to deep dive into the configuration of Thunderbird?

And would it be possible to add an item to declare that website links in e-mails have to be opened with Firefox in private mode, which is not the standard browser on my machine?

Thx!

I'm running Firefox under Ubuntu, Ubuntu is using Wayland which replaced X11.

Firefox's User Agent string still refers to X11, this does not cause me any problem but I'm curious.

I realise some websites might be expecting to see "X11" and could get upset if presented with "Wayland" instead but in various walks of life telling the truth is often the best policy.

about:support in Firefox shows me:

User Agent Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0 Window Protocol wayland

Very little to do with accounts, but none of the selectable topics cover 'user Interface'.

Used to be able to open different accounts in different windows. Can't remember how, but it was obvious. Once new window is created, each time Thunderbird is started it re-creates them. I accidentally closed one and can find no way to re-open it. I use three email accounts each needing a different mindset, so keeping them in different windows helps. Also one has a screendepth full of folders and so is easier to handle in its own window. (The others are still there but only take up one line each when collapsed.

140.7.1esr (64-bit) Mozilla Thunderbird Snap for Ubuntu ubuntu-snap-build - 1.0

I recently upgraded to version 115.10.1 and it is driving me utterly insane. It repeatedly turns on threading. I turn it off for a folder, next time I log in it's on again. I turn it off in a folder and copy that setting to all other folders, but it turns itself on again. Others say turn it off in Settings/Appearance. But I don't seem to have Settings/Appearance.

How do I stop this? Or is there a way to find out what version I was originally running and go back to that. I hadn't upgraded for a good while but my old version was much better. This one is also really slow and I hate the tiny text.

On upgrade to 152.0, a pop-up asked for options I have not seen before. I cannot find info about what the net.thunderbird option is, nor why I would or would not want to click it? Any help out there?

Thanks!