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can't access a closed window

I have enabled the option to open the previous windows and tabs. I had one window that I always closed last as it had a lot of groups that are important for my work, so i… (tuilleadh eolais)

I have enabled the option to open the previous windows and tabs. I had one window that I always closed last as it had a lot of groups that are important for my work, so it used to open every time I started Firefox. Sometimes, even if I closed the window by mistake without closing other windows, I was able to get it back by pressing ctrl+shift+n.

But yesterday, I might have closed it by mistake and when I pressed ctrl+shift+n , it didn't come back. I wasn't able to access my window and now it's all gone. I don't see anything in recently closed windows in history.

I need those tabs back as they are very important for my work. they were a lot of tabs. I had many groups but now all are gone. I tried by using the previous.jsonlz4 in the sessionstore-backup by renaming it in the default-release profile as sesstionstore.jsonlz4 but still wasn't able to access my window.

I didn't clear my history as the tabs opened in the window still show up in the history.

Kindly help as soon as possible

Réitithe 21 1 269

I had like 60 tabs on today, and I mistakenly turned off firefox, all disapperead, cannot bring them back on

Hi. I have all the automatic opening of the last session turned on. So for the last two months, when I fired up my PC, all the tabs came back on. That is, until today! Be… (tuilleadh eolais)

Hi. I have all the automatic opening of the last session turned on. So for the last two months, when I fired up my PC, all the tabs came back on. That is, until today!

Because I mistakenly clicked "X" when I had private browsing on in other window.

This created error that resulted in blank screen coming in... All my tabs are gone, and they are not in the recent history. How can I bring them back on"? they were just there not 10 minutes ago.

Réitithe 2 41

iOS: Switching tabs with gestures

Hi. I like to switch tabs in the iOS app with some gesture. Is that possible? The only thing I found in the documentation is that some keybinding exists, but I do not ha… (tuilleadh eolais)

Hi.

I like to switch tabs in the iOS app with some gesture. Is that possible?

The only thing I found in the documentation is that some keybinding exists, but I do not have a keyboard attached to my phone.

I also found some old request and some Reddit posts that swiping the address bar would do the trick. This did not work for me.

I am hoping for something like a three finger swipe anywhere, but have not spent much thought on a perfect UI integration.

I love to learn how to make switching TABs by gesture work.

Thank you for your work! Oliver

Réitithe 5 231

Closed Tab Groups

All my Tabs Group have disappeared from the Tab Bar. I can see the Closed Tab Groups in the drop down but i can't find a way to re-open Closed Tab Groups. Any clues welco… (tuilleadh eolais)

All my Tabs Group have disappeared from the Tab Bar. I can see the Closed Tab Groups in the drop down but i can't find a way to re-open Closed Tab Groups. Any clues welcome. Running 146.0 and on the beta update channel.

Réitithe 5 541

Problem viewing dark pdf

duplicate of /questions/1567084 thread Chrome based browsers display dark pdf correctly. Firefox does not. see attached images. all extension are disabled. … (tuilleadh eolais)

duplicate of /questions/1567084 thread

Chrome based browsers display dark pdf correctly. Firefox does not. see attached images. all extension are disabled.

Faoi Ghlas 98

Address sidebar contents disappear after turning on to send message. The side bar is still there but no contents.

Address sidebar CONTENTS disappears after turning on to forward or send a message, The sidebar is still there but empty of addresses, which do appear for about a second o… (tuilleadh eolais)

Address sidebar CONTENTS disappears after turning on to forward or send a message, The sidebar is still there but empty of addresses, which do appear for about a second on opening the forward message tab.

thank you Ron Herron
Réitithe 1 107

Emojis do not show on Firefox 146 on macOS

Emojis do not show on Firefox 146 on macOS. I downgraded to 145.0.2 and they do show, so it seems related to Firefox 146. I have macOS 26.2 running in both test cases. Em… (tuilleadh eolais)

Emojis do not show on Firefox 146 on macOS. I downgraded to 145.0.2 and they do show, so it seems related to Firefox 146.

I have macOS 26.2 running in both test cases.

Emoji in question: 👨🏻💻

Réitithe 7 219

Diabling AI features in future updates?

I read online that Firefox is planning on implementing AI features. Given the track record of AI in other browsers leaking private information, bogging down connectivity,… (tuilleadh eolais)

I read online that Firefox is planning on implementing AI features. Given the track record of AI in other browsers leaking private information, bogging down connectivity, and generally being a nuisance towards users, I was wondering if there will be opt out features in future updates? Or know of forum threads that will update with tutorials on how to turn off AI features?

If not, does anyone on this forum have recommendations for no-ai browsers?

Faoi Ghlas 5 354

Data Breach alert

I received an email from breach-alerts@mozilla.com informing me that Mozilla Monitor discovered a data breach that includes my personal information: Unfortunately, I don… (tuilleadh eolais)

I received an email from breach-alerts@mozilla.com informing me that Mozilla Monitor discovered a data breach that includes my personal information: Unfortunately, I don't know if this is a legitimate email from Mozilla. Can anyone confirm if it is or is not?

Thanks

Réitithe 4 302

Restoring Firefox bookmarks

Mozillers, I depend heavily in my environmental and other work on Firefox and am grateful for its ability to restore previous tabs when my laptop, not infrequently, stops… (tuilleadh eolais)

Mozillers,

I depend heavily in my environmental and other work on Firefox and am grateful for its ability to restore previous tabs when my laptop, not infrequently, stops working abruptly.

Now the much-used bookmarks have disappeared. A search site states promisingly:

"To restore Firefox bookmarks, use the built-in backup feature by going to Menu > Bookmarks > Manage Bookmarks > Import & Backup > Restore, then select a dated backup or a manual file (like a JSON backup) to bring back lost bookmarks..."

But my Firefox's Bookmarks drop-down menu has no Manage Bookmarks option. PLEASE, what must I do?

Elsewhere I managed to find this file which apparently contains recent bookmarks:

"C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\unk14jlv.default-release-1647366062305\bookmarkbackups\bookmarks-2025-12-26_95_4IdGtYxezJpwuH1UIiT1bRwe1K6bcGO8rv0mqa9rUWU=.jsonlz4"

But attempting to open it with Applications\firefox.exe (default) accomplishes nothing.

FOOL-proof instructions would be wonderful. Thank you.

Réitithe 12 339

Is Spell Checking broken?

Hi. I've downloaded dictionaries and languages, the check spelling option is enabled in the browser settings. However, browser doesn't want to do it automatically. I have… (tuilleadh eolais)

Hi. I've downloaded dictionaries and languages, the check spelling option is enabled in the browser settings. However, browser doesn't want to do it automatically. I have to manually enable it with RMB context menu (and re-select languages) for each website individually. Moreover, when the page refreshes, spell checking turning itself off again in RMB menu (but stays enabled in browser options).

  Is this really how it's supposed to work?
Réitithe 3 188

Remove blue ball from tab

How can I remove the moving blue ball from the tab of a frequently used website? It's distracting and hopefully not symptomatic of a problem It appeared on this new compu… (tuilleadh eolais)

How can I remove the moving blue ball from the tab of a frequently used website? It's distracting and hopefully not symptomatic of a problem It appeared on this new computer/monitor, used to be an icon Thanks, --Laurie

Réitithe 3 146

Sync failed between operating systems

I have changed operating systems from windows to linux mint. I made sure to sync my profile before uninstalling, but now the profile looks to be empty. there are no saved… (tuilleadh eolais)

I have changed operating systems from windows to linux mint. I made sure to sync my profile before uninstalling, but now the profile looks to be empty. there are no saved passwords or bookmarks. This worked when I changed between different windows devices last year, but this time it seems stuck. I will check on a windows device when able, but in the meantime, are there any other ways to troubleshoot this?

Réitithe 2 171

Cache and cookies

In Firefox, I have several windows open, each with many tabs. (And BTW, I love the Firefox tab-organization feature.) I would like to empty the cache and delete all cooki… (tuilleadh eolais)

In Firefox, I have several windows open, each with many tabs. (And BTW, I love the Firefox tab-organization feature.) I would like to empty the cache and delete all cookies. Will that close the open tabs? Is there a way to delete the cookies, empty the cache and preserve all windows & tabs?

      Thank you!
Réitithe 2 195

Video Reels playback

When I watch videos (reels) on Facebook, and sometimes on YouTube, I share a video either to messenger or my page, the whole string of videos I have already watched goes … (tuilleadh eolais)

When I watch videos (reels) on Facebook, and sometimes on YouTube, I share a video either to messenger or my page, the whole string of videos I have already watched goes back to the beginning of the string everytime. Only Firefox does this. I have 3 other browsers that work fine, but I prefer Firefox of course.

I'd appreciate a fix for this, Thanks

Réitithe 2 171