I-Firefox Community Forum

When accessing Outlook (https://outlook.office.com) using Firefox ESR version 128.9.0 and attempting to download a file attached to an email, the string 'UTF-8' is automatically inserted at the beginning of the file name, which is causing issues. This phenomenon does not occur with other browsers such as Edge or Chrome.

Is there a way to solve this problem?

Hi!

I've noticed dropped frames in videos for a while now, but only recently tested the issue. Using youtubes stats for nerds, I found that when videos have a small viewport resolution, it starts to drop frames. (I would test with other sites but only know of youtubes stats for nerds system to detect issues like this) For example a viewport resolution of 1250x703 does not drop frames, however by unmaximising the screen and the viewport resolution drops to 681x383, it begins dropping frames.

Using my 2nd monitor which has a smaller actual resolution, the video drops frames unless fullscreened, see recordings below. Test A | Firefox Maximised but video not fullscreen Test B | Firefox Maximised and video fullscreen This issue also occurs with picture-in-picture mode.

Disabling hardware acceleration fixes this issue but for some reason only affects firefox, using MS Edge with "graphics acceleration" enabled does not result in this issue. Is this potentially an issue specifically with how firefox handles hardware acceleration? Also since I require hardware acceleration to be enabled for 3D model work in my browser, is there something I'm missing here that would allow me to keep hardware acceleration on but not have this issue?

Any help is much appreciated, thanks!

This morning I went to check my email on gmail, and google asked me to sign in again. Easy, I thought. I entered my account, and then google asked for my passkey. Until this morning this meant that on my mac it would ask me to place my finger on the right key on the keyboard. This morning it just froze firefox indefinitely. I then tried on Safari, and it worked as expected. I checked the version of firefox: it's 136.0.1. Obviously something changed (i.e. broke!) with the new version. Has anybody else experienced this? Any suggested fixes?

Hi, I just finished writing a few lines of javascript to automate bookmark management. I tested my Addon using about:debugging > Temporary Extensions, and now I'd like to keep the extension loaded across firefox sessions.

What is the best process for doing this? I attempted to create a .xpi file but when installing via "about:addons > Install addon from file" I get the message "This addon could not be installed because it could not be verified".

What is Firefox's self-signing process for this? I don't want to have to install dev versions of the browser just to automate one task.

I run a Synology DSM server on my local network. The website page to load locally inside my LAN is along the lines of 127.0.0.1:1001.

MacOSX 15.0.1 FireFox(FF) 132.0 (aarch64)

Previously accessing the DSM via the local IP address worked fine with no problems. Now, following one of the last couple of FF updates, I get an "unable to connect" message.

I also have a domain that routes to my local server and I can still access the DSM via the internet http address through FF. So I know that DSM is running fine and I have verified the settings within DSM.

I can load the DSM via the local IP in both Safari and Chrome. Only FF says it's unable to connect. So that shows that my DSM settings are fine and the page is available and loads in Safari and Chrome via the local IP.

I searched the forum and found similar postings, but not quite the same issue as mine. I deleted the cache & cookies/site data. I ensured the Proxy mode in FF is set to "No Proxy". I do not have any extensions running or themes.

I am at a complete loss at what setting in FF I need to change to restore this functionality.

Thanks, Matt

A sidebar has appeared out of nowhere. I removed all extension on that sidebar and it still doesn't go away. I already have a bookmark bar and extensions at the top bar. I don't want another sidebar at every firefox window. How do I remove the sidebar, please.

I use Google search and do not like the AI overview feature. In the Chrome, Edge, and Opera browser I've added an extension that blocks the AI. What I've noticed when I use FF I see no AI results when using Google search and I've not added an AI overview block extension. Is there something different about FF that prevents AI results from showing without the need for an extension? I look forward to your comments. Thanks

I updated firefox through apt, and since then, have not been able to log into twitch I am on ubuntu 24

apt list --installed | grep firefox firefox/mozilla,now 144.0.2~build1 amd64 [installed]

Attempting to log in returns the generic "Your browser is not currently supported"

hi for some reason twitch.tv or some other websites will no longer play videos on my pc and i have no idea why, firefox works fine on my laptop

I've freshly reinstalled Windows 11 and after trying to access and watch a movie on any of these sites I get an error (see the pictures).

Browser version: 137.0.1 (64 bit) Widevine version: 4.10.2891.0

Already tried to disable/enable DRM. Already reinstalled firefox. Already manually installed widevine. No clue what could be causing this issue.

I have lost my tabs after the recent update. They used to show all tab groups in toolbar icon as mentioned here (https://support.mozilla.org/en-US/kb/tab-groups) in manage tabs section. Only the groups that were open are retained, the groups which were closed are lost. They contained important tabs which I haven't bookmarked. I didn't see any policy of removal of inactive tab groups after certain time, any help would be really appreciated. I use the desktop app on Linux.

On Firefox browser, I cannot Copy a file in Studio Code Server (within Home Assistant). SCS is open in HA in a Firefox tab. I get the error popup "Unable to read from the browser's clipboard. Please make sure you have granted access for this website to read from the clipboard." "Learn More" links to https://code.visualstudio.com/docs/remote/codespaces#_how-do-i-allow-vs-code-to-access-my-clipboard-for-reading and the "How do I allow VS Code to access my clipboard for reading?" section. But I cannot find similar settings in Firefox's Settings menu.

Any suggestions please on how to resolve this? I'm sure I used ~ a year back to be able to Copy a file ok in VSCode on Firefox. Thank you.

I had a background image for the new tab page that has suddenly stopped working, it just displays a white screen. I clicked the 'reset to default' button next to 'Wallpapers' on the new tab page to try to fix the problem but nothing happens. No wallpapers show up under that section either where it used to be when it was working. I've restarted Firefox and the same thing happens. I have not enabled any third party CSS wallpaper.

Apart from that, everything else is working as it should. I'm sort of a computer-idiot so if anyone could please use layman's terms it would be very much appreciated!

I'm visually impaired and had originally used a CSS code to fix this problem, but that was a couple of years ago. I just upgraded to 131.0.3 (64 bit) and evidently, that wiped out all my CSS changes. I tried to use the about:config code to change it, but it no longer works. I managed to increase the icon size a little by changing the density to normal, then back to compact. Even on normal, it was all too small.

I don't want to use another profile, because every time I do, I lose so much that it takes me hours to reinstall it all.

Is there an easier way to do this? I've tried a couple of things suggested online, but they were old settings suggestions, and they no longer work either.

ALSO, I now have to use F11 full screen to be able to perform anything on the toolbars. Before this update, I could just move my cursor up to bring the toolbars down, and use the back arrow or refresh easily. Now, the toolbars immediately go back up and I have to use F11 to do anything. How do I fix this?

TIA for any help you can give me.

To whom it may concern,

I have an angular application accessing data from a 3rd party data provider. To get data, POST-requests are sent to the data provider REST API (https://capzlog.aero). The application works correctly using Google Chrome and Microsoft Edge. However, when using Firefox, the following error appears:

"Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://capzlog.aero/api/pel/public/externalsystemflights/GetMissingIDs. (Reason: CORS request did not succeed). Status code: (null)."

As the POST request contains basic authentication, a preflight-request (OPTIONS) is first sent to the data provider. This request fails when using Firefox (but not when using Chrome or Edge), see attached screen-shots.

I have spent 4 days on the internet trying to figure out a solution, but I could not solve the issue. I tried the following: 1) check the certificates of the 3rd party provider (https://capzlog.aero): There are no issues. 2) start Firefox in safe-mode, disactivating the "Enhanced Tracking Protecting", clearing the cache. 3) changing the following Firefox settings:

   security.enterprise_roots.enabled (true<->false)
   security.tls.version.min (1<->3)
   security.tls.version.max (2<->4)
   network.http.network-changed.timeout

I tried sending the "OPTIONS"-request using curl and it worked as expected:

curl --verbose -XOPTIONS -H "Access-Control-Request-Method: POST" -H "Origin: https://projectz.numericalsolutions.ch" https://capzlog.aero/api/pel/public/externalsystemflights/GetMissingIDs

• Host capzlog.aero:443 was resolved.
• IPv6: (none)
• IPv4: 156.67.9.80
• Trying 156.67.9.80:443...
• Connected to capzlog.aero (156.67.9.80) port 443
• ALPN: curl offers h2,http/1.1
• TLSv1.3 (OUT), TLS handshake, Client hello (1):
• TLSv1.3 (IN), TLS handshake, Server hello (2):
• TLSv1.2 (IN), TLS handshake, Certificate (11):
• TLSv1.2 (IN), TLS handshake, Server key exchange (12):
• TLSv1.2 (IN), TLS handshake, Server finished (14):
• TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
• TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
• TLSv1.2 (OUT), TLS handshake, Finished (20):
• TLSv1.2 (IN), TLS handshake, Finished (20):
• SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384 / secp384r1 / rsaEncryption
• ALPN: server accepted h2
• Server certificate:
• subject: CN=capzlog.aero
• start date: Dec 31 10:14:59 2024 GMT
• expire date: Mar 31 10:14:58 2025 GMT
• subjectAltName: host "capzlog.aero" matched cert's "capzlog.aero"
• issuer: C=US; O=Let's Encrypt; CN=R10
• SSL certificate verify ok.
• Certificate level 0: Public key type RSA (3072/128 Bits/secBits), signed using sha256WithRSAEncryption
• Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
• Certificate level 2: Public key type RSA (4096/152 Bits/secBits), signed using sha256WithRSAEncryption
• using HTTP/2
• [HTTP/2] [1] OPENED stream for https://capzlog.aero/api/pel/public/externalsystemflights/GetMissingIDs
• [HTTP/2] [1] [:method: OPTIONS]
• [HTTP/2] [1] [:scheme: https]
• [HTTP/2] [1] [:authority: capzlog.aero]
• [HTTP/2] [1] [:path: /api/pel/public/externalsystemflights/GetMissingIDs]
• [HTTP/2] [1] [user-agent: curl/8.6.0]
• [HTTP/2] [1] [accept: */*]
• [HTTP/2] [1] [access-control-request-method: POST]
• [HTTP/2] [1] [origin: https://projectz.numericalsolutions.ch]

> OPTIONS /api/pel/public/externalsystemflights/GetMissingIDs HTTP/2 > Host: capzlog.aero > User-Agent: curl/8.6.0 > Accept: */* > Access-Control-Request-Method: POST > Origin: https://projectz.numericalsolutions.ch > < HTTP/2 204 < cache-control: private < server: Microsoft-IIS/10.0 < access-control-allow-origin: https://projectz.numericalsolutions.ch < access-control-allow-credentials: true < x-aspnet-version: 4.0.30319 < x-powered-by: ASP.NET < date: Thu, 16 Jan 2025 07:12:32 GMT <

• HTTP/2 stream 1 was not closed cleanly: HTTP_1_1_REQUIRED (err 13)
• Downgrades to HTTP/1.1
• Connection #0 to host capzlog.aero left intact
• Issue another request to this URL: 'https://capzlog.aero/api/pel/public/externalsystemflights/GetMissingIDs'
• Found bundle for host: 0x55ecfa0a46e0 [can multiplex]
• Hostname capzlog.aero was found in DNS cache
• Trying 156.67.9.80:443...
• Connected to capzlog.aero (156.67.9.80) port 443
• ALPN: curl offers http/1.1
• SSL reusing session ID
• TLSv1.3 (OUT), TLS handshake, Client hello (1):
• TLSv1.3 (IN), TLS handshake, Server hello (2):
• TLSv1.2 (IN), TLS handshake, Finished (20):
• TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
• TLSv1.2 (OUT), TLS handshake, Finished (20):
• SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384 / secp384r1 / UNDEF
• ALPN: server accepted http/1.1
• Server certificate:
• subject: CN=capzlog.aero
• start date: Dec 31 10:14:59 2024 GMT
• expire date: Mar 31 10:14:58 2025 GMT
• subjectAltName: host "capzlog.aero" matched cert's "capzlog.aero"
• issuer: C=US; O=Let's Encrypt; CN=R10
• SSL certificate verify ok.
• using HTTP/1.x

> OPTIONS /api/pel/public/externalsystemflights/GetMissingIDs HTTP/1.1 > Host: capzlog.aero > User-Agent: curl/8.6.0 > Accept: */* > Access-Control-Request-Method: POST > Origin: https://projectz.numericalsolutions.ch > < HTTP/1.1 204 No Content < Cache-Control: private < Transfer-Encoding: chunked < Server: Microsoft-IIS/10.0 < Access-Control-Allow-Origin: https://projectz.numericalsolutions.ch < Access-Control-Allow-Credentials: true < X-AspNet-Version: 4.0.30319 < X-Powered-By: ASP.NET < Date: Thu, 16 Jan 2025 07:12:32 GMT <

• Connection #1 to host capzlog.aero left intact

Here, a comparison of the "OPTIONS"-HTTP-request as sent by Chrome and by Firefox:

CHROME OPTIONS /api/pel/public/externalsystemflights/GetMissingIDs HTTP/1.1 Accept: */* Accept-Encoding: gzip, deflate, br, zstd Accept-Language: en-US,en;q=0.9a comparison of the "OPTIONS"-HTTP-request as sent by Chrome and by Firefox: Access-Control-Request-Headers: authorization,content-type Access-Control-Request-Method: POST Connection: keep-alive Host: capzlog.aero Origin: https://projectz.numericalsolutions.ch Referer: https://projectz.numericalsolutions.ch/ Sec-Fetch-Dest: empty Sec-Fetch-Mode: cors Sec-Fetch-Site: cross-site User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

FIREFOX OPTIONS /api/pel/public/externalsystemflights/GetMissingIDs undefined Host: capzlog.aero User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0 Accept: */* Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br, zstd Access-Control-Request-Method: POST Access-Control-Request-Headers: authorization,content-type Referer: https://projectz.numericalsolutions.ch/ Origin: https://projectz.numericalsolutions.ch Connection: keep-alive Sec-Fetch-Dest: empty Sec-Fetch-Mode: cors Sec-Fetch-Site: cross-site Priority: u=4 TE: trailers

And the response header as seen by Chrome:

CHROME HTTP/1.1 200 OK Content-Type: application/json; charset=utf-8 Content-Language: en Server: Microsoft-IIS/10.0 Access-Control-Allow-Origin: https://projectz.numericalsolutions.ch Access-Control-Allow-Credentials: true Set-Cookie: AppSettings=Culture=en-US&Language=English&CountryAlpha2=CH; expires=Fri, 31-Dec-9999 23:59:59 GMT; path=/; secure; SameSite=Lax X-Powered-By: ASP.NET Date: Thu, 16 Jan 2025 07:19:59 GMT Content-Length: 2

Here, a comparison of the Network Traffic as seen for Chrome and for Firefox:

CHROME 17:07:46.550256 IP ANYPC.57562 > 156.67.9.80.https: Flags [P.], seq 1480736564:1480737180, ack 2430285572, win 501, length 616 17:07:46.557654 IP 156.67.9.80.https > ANYPC.57562: Flags [P.], seq 1:393, ack 616, win 8212, length 392 17:07:46.557654 IP 156.67.9.80.https > ANYPC.57562: Flags [P.], seq 393:427, ack 616, win 8212, length 34 17:07:46.557683 IP ANYPC.57562 > 156.67.9.80.https: Flags [.], ack 393, win 501, length 0 17:07:46.557688 IP ANYPC.57562 > 156.67.9.80.https: Flags [.], ack 427, win 501, length 0 17:07:46.558334 IP ANYPC.57562 > 156.67.9.80.https: Flags [F.], seq 616, ack 427, win 501, length 0 17:07:46.558741 IP ANYPC.42786 > 156.67.9.80.https: Flags [S], seq 2926210792, win 64240, options [mss 1460,sackOK,TS val 2936933242 ecr 0,nop,wscale 7], length 0 17:07:46.562927 IP 156.67.9.80.https > ANYPC.57562: Flags [F.], seq 427, ack 617, win 8212, length 0 17:07:46.562962 IP ANYPC.57562 > 156.67.9.80.https: Flags [.], ack 428, win 501, length 0 17:07:46.563492 IP 156.67.9.80.https > ANYPC.42786: Flags [S.], seq 1974100572, ack 2926210793, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0 17:07:46.563514 IP ANYPC.42786 > 156.67.9.80.https: Flags [.], ack 1, win 502, length 0 17:07:46.565558 IP ANYPC.42786 > 156.67.9.80.https: Flags [P.], seq 1:1743, ack 1, win 502, length 1742 17:07:46.572094 IP 156.67.9.80.https > ANYPC.42786: Flags [.], ack 1743, win 8212, length 0 17:07:46.572094 IP 156.67.9.80.https > ANYPC.42786: Flags [P.], seq 1:161, ack 1743, win 8212, length 160 17:07:46.572133 IP ANYPC.42786 > 156.67.9.80.https: Flags [.], ack 161, win 501, length 0 17:07:46.572276 IP ANYPC.42786 > 156.67.9.80.https: Flags [P.], seq 1743:1794, ack 161, win 501, length 51 17:07:46.572421 IP ANYPC.42786 > 156.67.9.80.https: Flags [P.], seq 1794:3197, ack 161, win 501, length 1403 17:07:46.583942 IP 156.67.9.80.https > ANYPC.42786: Flags [.], ack 3197, win 8206, length 0 17:07:46.710020 IP 156.67.9.80.https > ANYPC.42786: Flags [P.], seq 161:638, ack 3197, win 8206, length 477 17:07:46.751327 IP ANYPC.42786 > 156.67.9.80.https: Flags [.], ack 638, win 501, length 0 17:07:46.754201 IP 156.67.9.80.https > ANYPC.42786: Flags [P.], seq 161:638, ack 3197, win 8206, length 477 17:07:46.754231 IP ANYPC.42786 > 156.67.9.80.https: Flags [.], ack 638, win 501, options [nop,nop,sack 1 {161:638}], length 0$

FIREFOX 17:08:28.962851 IP ANYPC.35980 > 156.67.9.80.https: Flags [S], seq 2319755284, win 64240, options [mss 1460,sackOK,TS val 2936975646 ecr 0,nop,wscale 7], length 0 17:08:28.972248 IP 156.67.9.80.https > ANYPC.35980: Flags [S.], seq 1053801102, ack 2319755285, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0 17:08:28.972330 IP ANYPC.35980 > 156.67.9.80.https: Flags [.], ack 1, win 502, length 0 17:08:28.974266 IP ANYPC.35980 > 156.67.9.80.https: Flags [P.], seq 1:1894, ack 1, win 502, length 1893 17:08:28.987389 IP 156.67.9.80.https > ANYPC.35980: Flags [.], ack 1894, win 1026, length 0 17:08:28.987433 IP 156.67.9.80.https > ANYPC.35980: Flags [P.], seq 2921:3937, ack 1894, win 1026, length 1016 17:08:28.987461 IP ANYPC.35980 > 156.67.9.80.https: Flags [.], ack 1, win 502, options [nop,nop,sack 1 {2921:3937}], length 0 17:08:28.987598 IP 156.67.9.80.https > ANYPC.35980: Flags [.], seq 1:1461, ack 1894, win 1026, length 1460 17:08:28.987647 IP ANYPC.35980 > 156.67.9.80.https: Flags [.], ack 1461, win 524, options [nop,nop,sack 1 {2921:3937}], length 0 17:08:28.987682 IP 156.67.9.80.https > ANYPC.35980: Flags [.], seq 1461:2921, ack 1894, win 1026, length 1460 17:08:28.987707 IP ANYPC.35980 > 156.67.9.80.https: Flags [.], ack 3937, win 547, length 0 17:08:28.994553 IP ANYPC.35980 > 156.67.9.80.https: Flags [P.], seq 1894:2052, ack 3937, win 547, length 158 17:08:29.005007 IP 156.67.9.80.https > ANYPC.35980: Flags [P.], seq 3937:3988, ack 2052, win 1025, length 51 17:08:29.005007 IP 156.67.9.80.https > ANYPC.35980: Flags [P.], seq 3988:4057, ack 2052, win 1025, length 69 17:08:29.005700 IP ANYPC.35980 > 156.67.9.80.https: Flags [.], ack 4057, win 547, length 0 17:08:29.006086 IP ANYPC.35980 > 156.67.9.80.https: Flags [P.], seq 2052:2151, ack 4057, win 547, length 99 17:08:29.006123 IP ANYPC.35980 > 156.67.9.80.https: Flags [P.], seq 2151:2577, ack 4057, win 547, length 426 17:08:29.008948 IP ANYPC.35980 > 156.67.9.80.https: Flags [P.], seq 2577:2615, ack 4057, win 547, length 38 17:08:29.018116 IP 156.67.9.80.https > ANYPC.35980: Flags [.], ack 2615, win 1023, length 0 17:08:29.018116 IP 156.67.9.80.https > ANYPC.35980: Flags [P.], seq 4057:4095, ack 2615, win 1023, length 38 17:08:29.024518 IP 156.67.9.80.https > ANYPC.35980: Flags [P.], seq 4095:4322, ack 2615, win 1023, length 227 17:08:29.024518 IP 156.67.9.80.https > ANYPC.35980: Flags [P.], seq 4322:4364, ack 2615, win 1023, length 42 17:08:29.024943 IP ANYPC.35980 > 156.67.9.80.https: Flags [.], ack 4364, win 570, length 0 17:08:35.342337 IP ANYPC.42786 > 156.67.9.80.https: Flags [.], ack 1974101210, win 501, length 0 17:08:35.349317 IP 156.67.9.80.https > ANYPC.42786: Flags [.], ack 1, win 8206, length 0

I really do not know what to do anymore to solve that problem.

As the problem is impacting hundreds of users, I really hope there is a solution.

In advance thanks for your help.

Yahoo isn't loading at all for me, more specifically guce.yahoo.com. I have managed to get into the login.yahoo.com page and log in but after the log in process it goes to the first page again and gives me the same "The connection has timed out". I just installed the browser and this might make me not use it ngl. I have tried both clearing cookies and troubleshooting mode.

Hi, I used Firefox browser at work since it had the best add-in for tab groups (Simple Tab Groups). Unfortunately browser is not supported any more. Is there a portable version that can be run without installing, from Mozilla.

I read a post that indicated it was available from PortableApps, but am not conversant enough to know that it's 100% safe. Believe that it was able to be updated as well.

I am running Firefox 144.0 on kubuntu 24.04.3 LTS I have lost sound on Firefox. I have opened the same sites in Chrome and the sound is working fine. It's only in Firefox. I have tried several sites including Udemy, YouTube, and radio programs, no sound from Firefox. The problem started in the middle of a Jit.Si session. All of a sudden the sound disappeared. I thought that restart Firefox would help, then restart the computer would help. But the problem has continued. The speakers is turned on the volume is up, just not a sound from Firefox. What to do?