Firefox Community Forum

Hello every professional engineer

I knew how to convert the Firefox file sessionstore.jsonlz4 to .json file by using this website https://www.jeffersonscher.com/ffu/scrounger.html

and after editing the resulting .json file

How can I convert it back to .jsonlz4 file to return it to my Firefox profile as it was?

Hi, I am a big fan of Firefox Sync in general, and of the "send tab to other device" feature in particular. I have Firefox on all my devices (Android phone, iPad, PC, work laptop and a laptop in a cabin) and while I'm browsing, I do send tabs to other devices a lot, because it's a cool stuff to checkout, but not in the moment, or not in that context: news articles or blog posts discovered on the couch but relevant to work, some items I see in the shop but I want to check dimensions prior to buying, some cool idea to check out while at the cabin, etc. My day-to-day browsing experience relies heavily on that feature.

My issue is that one of the device (laptop in the cabin) is used only randomly, with sometimes weeks between it's turned on again. And after around 2 weeks, that entry disappears from the possible devices I can send the tab too. I do understand where it comes from, as it allows keeping a clean and meaningful list, I can live with that, no worries.

But is there a way to "keep alive" a device beyond these two weeks? At the minimum, something on the mozilla account's device list, like a "confirm still relevant" button next to the "sign out" one.

Thanks Dietmar

For a long time I've used Firefox on Linux with multiple instances each with their own profile folder. Today when I try to run these instances with separate profile folders I get the following error:

> Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile.

Profiles are created like this:

firefox --new-instance --createprofile "PROFILENAME ~/.firefox-PROFILENAME"

They are run like this:

firefox --new-instance --profile "~/.firefox-PROFILENAME"

It seems something has broken with the instance isolation as this is now throwing an error. Additionally I run "createprofile" it doesn't seem to actually create the folder.

Just for info this site works fine on other browsers on same machine, and on other machines. It is a Firefox issue.

Running version 127.0.1 on Linux.

Message is

Secure Connection Failed

An error occurred during a connection to vehicleenquiry.service.gov.uk. PR_CONNECT_RESET_ERROR

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

I was in the middle of watching the Phillies and the Braves play on Apple TV+ 7/5/24. While watching the game, the screen flashed a message I couldn't catch and that was the end of viewing Apple TV+. From that moment on all that was displayed was the original promotional page (attached) that seemed to have all it's links disabled. After playing with it for awhile with no success I switched to Chrome and the streaming ran okay. I then reinstalled a clean Firefox but I still have the same issue. A dead Apple TV+. I am baffled by this. Need help. Please see attachment. I am running Windows 11

Regards, ctg

Whenever I log into my amazon account, a windows prompt pops up telling me to use "windows hello passkeys" so I can log into the website using my windows pin/fingerprint. I cannot find a way to stop this from popping up, and I do not want to be bothered by it. Is there a way to prevent this from showing? I can't find any solution online

Similar to what @KW was experiencing here: https://support.mozilla.org/en-US/questions/1392858

I'm also having the same issue. I tried replying to that thread, but it's been archived.

I have two printers that were removed from macOS System Settings in Sonoma 14.5. They are showing in the print dialogue menu in Firefox 127.0.2 on both my laptop (MacBook Air M1) and desktop (Mac Studio).

Rebooting the computer, restarting Firefox, etc. haven't resolved the issue.

Hi. i ran into a broken problem. sometimes when i bootup my pc and start the firefox, My windows crashes immediately. what shuld i do and how i can send the firefox log files to mozilla team?

I'm having issues with videos loading on ANY webiste, YouTube ect.... This started happening very recently out of the blue. Videos work fine on Edge. Additionally, I cannot run Firefox in troubleshooting mode? It crashes. I tried "refreshing" and reinstalling Firefox to no avail. I am using AdAware AV and AVG anti viruses if it matters, I have tired disabling both and loading FIrefox, no changes.

FB messenger voice & video no longer compatible with Firefox (Mac OS). Is there a fix or is it Meta playing nasty games with Firefox users?

I have latest FireFox, iOS & Messenger updates.

/edit: moved thread from Firefox for iOS (iPhone/iPad) to Firefox section as you have macOS.

Firefox's PDF viewer incorrectly applies user-defined font settings intended for HTML pages, resulting in illegible PDFs and requiring time-consuming workarounds.

Key Points: 1. When "Allow pages to choose their own fonts" is disabled in Firefox settings, the built-in PDF viewer renders some PDFs with incorrect fonts, replacing characters with icons and gifs. 2. This setting should only affect HTML pages, not PDFs, as PDFs are designed to maintain the author's exact formatting. 3. Current workarounds (saving/opening PDFs locally or toggling the font settings) are inconvenient and disrupt workflow. (Open a settings tab, navigate to fonts, navigate to advanced, toggle the option, select okay, return to prior tab, reload, view without error, then repeat the process to restore preferred settings.) 4. Users who prefer custom fonts for HTML content are forced to choose between readable PDFs and their preferred web browsing experience.

Background: HTML is intended to decompose information exchange in such a way that the viewer has control of aspects such as fonts; while PDF is a format designed specifically to present exactly as the author intended. The difference is the primary reason an author would choose to use pdf vs html. The issues can be reproduced with B612 and other fonts, in Firefox 127.0.2 and many earlier versions, on github repositories pages that embed pdf files, and most other pdf files opened with the viewer.

Proposed Solution: Implement a separate font control setting for the PDF viewer, allowing users to maintain their custom font preferences for HTML content while correctly rendering PDFs with the author's intended fonts. Or, simply disallow the setting to apply to the PDF Viewer.

Impact: Resolving this issue will significantly improve user experience, maintain the integrity of PDF documents, and eliminate the need for disruptive workarounds, ultimately enhancing productivity for affected users.

Hi there! After a short elektricity blackout my PC was rebooted and I lost functionality of shortcuts on Mozilla default home page, turning on or off this shortcuts leads nowhere and just move search bar.

TeamVIEWER icon showed up on laptop this morning - my regular Mac desktop screen missing, figured out it TV was appearing under Guest User. Then I made error of downloading installer thinking my son was wanting to help me clean up my lap top from afar because I am 80 and get very confused and had asked him for help because I don't understand the tech vocabulary. Anyway, I can't get rid of it. It had someone's PW (hidden) an ID and could be 'remote controlled'. I saw a yellow caution sign appear so I stopped trying to install. but now I get a TEAM VIEWER Package that won't delete or go away.

This is very scary to a senior because EVERYONE is warning us don't click on unknowns. No one has used my laptop. I live alone. It appeared by itself this morning. And it had a Safari icon but I use only Firefox.

Thank you.

I have set Firefox to not automatically restore the previous session on launch. That is, "Open previous windows and tabs" is unchecked in the Startupsettings.

Most of the time it does not do so, however the previous session will get erroneously auto-restored in the folowing circumstances.

Open a few tabs in a normal Firefox window. Fully quit Firefox (via, for example, pressing ctrl+shift+Q). Open a private window first. Open a normal window second.

What should happen is that the new normal window contains just a single new tab. What actually happens is that the tabs that were open in the previous session get auto-restored in this normal window.

To sum up, there is no auto-session restore if Firefox is launched with a normal window first. There is auto-session restore if Firefox is launched with a private window first, and then a normal window is opened second.

Is this a known issue, and are there any known fixes to prevent the auto-session restore in the latter case also?

Problem: Persistent 150 KB of Cached Web Content For several years, I have gone to “Settings” / “Privacy & Security” / “Cookies and Site Data,” clicked the Clear Data…” button, checked both “Cookies and Site Data,” and “Cached Web Content,” and clicked “Clear”, and consistently gotten BOTH “Cookies and Site Data,” and “Cached Web Content” down to “0” zero. Recently, I have been unable to “Cached Web Content” to go below “150 KB of disk space.”

         I have NOTHING listed in “Manage Cookies and Site Data” or “Exceptions -- Cookies and Site Data.”
         I have tried reinstalling, but the problem has persisted.
         On the assumption that this is malware problem, I have continued to use Mozzella VPN, but stopped using the program for browsing, etc.  Should I stop using it altogether until the problem is fixed?
         Can you tell me how to get rid of the last “150 KB” of “Cached Web Content”?

Firefox keeps going off for from 5 seconds to about 20 seconds. It happens several times a minute. The screen goes blank and I can’t click on anything. Really aggravating. I would appreciate any help. Thanks