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Obscure canvas rendering issue

Hello, I have created a webpage with a canvas element that allows the user to draw an irregular path by pressing down the mouse, similar to the free drawing of a paint … (read more)

Hello,

I have created a webpage with a canvas element that allows the user to draw an irregular path by pressing down the mouse, similar to the free drawing of a paint application. The issue is that the very first time that the user presses the mouse, the line stops abruptly, while the next times the lines are drawn correctly. The events seem to fire correctly and the page works fine at Chromium, so it seems to be a Firefox issue. You can find the html page below. I am curious, what could be the problem?

<!DOCTYPE html>
<html lang="el">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Canvas</title>
  <style>
    #canvas {
      background-color: whitesmoke;
      border: solid 2px brown;
    }
  </style>
</head>

<body>
  <canvas id="canvas"></canvas>

  <script>
    function startDrawing(e) {
      isDrawing = true;
      context.beginPath();
      context.moveTo(e.offsetX, e.offsetY);
    }

    function draw(e) {
      if (isDrawing) {
        context.lineTo(e.offsetX, e.offsetY);
        context.stroke();
      }
    }

    function stopDrawing(e) {
      console.log("stopped drawing")
      isDrawing = false;
    }

    const canvas = document.getElementById('canvas');
    const context = canvas.getContext('2d');
    var isDrawing = false;
    canvas.width = 1000;
    canvas.height = 1000;
    context.strokeStyle = "#913d88";
    context.lineWidth = 2;
    canvas.onmousedown = startDrawing;
    canvas.onmouseup = stopDrawing;
    canvas.onmousemove = draw;
  </script>
</body>

</html>

Asked by ngiatsog 2 days ago

Last reply by jscher2000 - Support Volunteer 1 day ago

Apostrophe is not showing up correctly ( )

Somehow I cannot type an apostrophe, whenever I do it just shows whats between the brackets ( ). What I do: 1. Press the apostrophe button 2. Press space Expected res… (read more)

Somehow I cannot type an apostrophe, whenever I do it just shows whats between the brackets ( ).

What I do: 1. Press the apostrophe button 2. Press space

Expected result: '

Actual result:


I m on Firefox Linux and my keybord is set on INTL

Asked by Jonezz 3 days ago

Last reply by cor-el 2 days ago

  • Solved

Domain uniformity no uniform

FireFox assumes that text size is the same for all pages in a domain, rferl.org for example. That is _not_ true. If I have set size to 50% and then take a link to a page … (read more)

FireFox assumes that text size is the same for all pages in a domain, rferl.org for example. That is _not_ true. If I have set size to 50% and then take a link to a page that's different and have to set size to 67% to read it, when I return to the original page, size is 67% and text is too large.

Asked by Mark Filipak 2 days ago

Answered by TyDraniu 2 days ago

  • Solved

Establishing a WebRTC connection from the Firefox browser (VP8 inactive)

Hello, maybe someone else seen the same issue. When trying to establish a webrtc connection with the Firefox browser, my server sends a following message (video H264): ``… (read more)

Hello, maybe someone else seen the same issue. When trying to establish a webrtc connection with the Firefox browser, my server sends a following message (video H264): ``` 0:00:01.701967159 90 0x7fc2a0002030 LOG webrtcsrc-signaller net/webrtc/src/signaller/imp.rs:172:gstrswebrtc::signaller::imp::Signaller::connect::{{closure}}::{{closure}}: Sending websocket message Peer(PeerMessage { session_id: "56a17f8d-2585-4d4b-9f2e-3009450a19e9", peer_message: Sdp(Offer { sdp: "v=0\r\no=- 9144757257615355393 0 IN IP4 0.0.0.0\r\ns=-\r\nt=0 0\r\na=ice-options:trickle\r\na=group:BUNDLE video0 audio1 application2\r\nm=video 9 UDP/TLS/RTP/SAVPF 96 98 99 100 101\r\nc=IN IP4 0.0.0.0\r\na=setup:actpass\r\na=ice-ufrag:uOJFtPAyRCKX4NDQcU3VExzLsFcfCWYc\r\na=ice-pwd:jRots1p0FnmxmwLoVqAq7lK84rAwBk/4\r\na=rtcp-mux\r\na=rtcp-rsize\r\na=sendonly\r\na=rtpmap:96 H264/90000\r\na=rtcp-fb:96 nack\r\na=rtcp-fb:96 nack pli\r\na=rtcp-fb:96 ccm fir\r\na=rtcp-fb:96 transport-cc\r\na=fmtp:96 packetization-mode=1;profile-level-id=42001f;level-asymmetry-allowed=1\r\na=rtpmap:98 red/90000\r\na=rtpmap:99 ulpfec/90000\r\na=rtpmap:100 rtx/90000\r\na=fmtp:100 apt=96\r\na=rtpmap:101 rtx/90000\r\na=fmtp:101 apt=98\r\na=ssrc-group:FID 2834502081 1415006916\r\na=ssrc:2834502081 msid:user1488703113@host-437c139 webrtctransceiver0\r\na=ssrc:2834502081 cname:user1488703113@host-437c139\r\na=ssrc:1415006916 msid:user1488703113@host-437c139 webrtctransceiver0\r\na=ssrc:1415006916 cname:user1488703113@host-437c139\r\na=mid:video0\r\na=fingerprint:sha-256 9E:33:DF:EB:63:72:42:77:49:8D:0C:0E:FC:61:51:C1:56:53:AF:05:D9:F7:61:8F:95:DD:7D:FF:99:1A:64:E8\r\na=rtcp-mux-only\r\nm=audio 0 UDP/TLS/RTP/SAVPF 97\r\nc=IN IP4 0.0.0.0\r\na=setup:actpass\r\na=ice-ufrag:uOJFtPAyRCKX4NDQcU3VExzLsFcfCWYc\r\na=ice-pwd:jRots1p0FnmxmwLoVqAq7lK84rAwBk/4\r\na=bundle-only\r\na=rtcp-mux\r\na=rtcp-rsize\r\na=sendonly\r\na=rtpmap:97 OPUS/48000/2\r\na=rtcp-fb:97 transport-cc\r\na=fmtp:97 sprop-stereo=1;sprop-maxcapturerate=48000\r\na=ssrc:1127273264 msid:user1488703113@host-437c139 webrtctransceiver1\r\na=ssrc:1127273264 cname:user1488703113@host-437c139\r\na=mid:audio1\r\na=fingerprint:sha-256 9E:33:DF:EB:63:72:42:77:49:8D:0C:0E:FC:61:51:C1:56:53:AF:05:D9:F7:61:8F:95:DD:7D:FF:99:1A:64:E8\r\na=rtcp-mux-only\r\nm=application 0 UDP/DTLS/SCTP webrtc-datachannel\r\nc=IN IP4 0.0.0.0\r\na=setup:actpass\r\na=ice-ufrag:uOJFtPAyRCKX4NDQcU3VExzLsFcfCWYc\r\na=ice-pwd:jRots1p0FnmxmwLoVqAq7lK84rAwBk/4\r\na=bundle-only\r\na=mid:application2\r\na=sctp-port:5000\r\na=fingerprint:sha-256 9E:33:DF:EB:63:72:42:77:49:8D:0C:0E:FC:61:51:C1:56:53:AF:05:D9:F7:61:8F:95:DD:7D:FF:99:1A:64:E8\r\n" }) }) ``` and Firefox responds with VP8 inactive message: ``` 0:00:02.007638187 90 0x7fc2a0002030 TRACE webrtcsrc-signaller net/webrtc/src/signaller/imp.rs:324:gstrswebrtc::signaller::imp::Signaller::handle_message:<GstWebRTCSignaller@0x563ce91ed190> Received message {"type": "peer", "sessionId": "56a17f8d-2585-4d4b-9f2e-3009450a19e9", "sdp": {"type": "answer", "sdp": "v=0\r\no=mozilla...THIS_IS_SDPARTA-99.0 2114996636650547664 0 IN IP4 0.0.0.0\r\ns=-\r\nt=0 0\r\na=sendrecv\r\na=fingerprint:sha-256 16:EC:66:ED:36:A1:D4:E0:CB:95:24:4A:E2:40:CA:53:E5:AB:D5:FF:F5:9C:5C:81:EB:83:F8:E4:BD:89:9F:03\r\na=ice-options:trickle\r\na=msid-semantic:WMS *\r\nm=video 0 UDP/TLS/RTP/SAVPF 120\r\nc=IN IP4 0.0.0.0\r\na=inactive\r\na=mid:video0\r\na=rtpmap:120 VP8/90000\r\nm=audio 9 UDP/TLS/RTP/SAVPF 97\r\nc=IN IP4 0.0.0.0\r\na=recvonly\r\na=fmtp:97 maxplaybackrate=48000;stereo=1;useinbandfec=1\r\na=ice-pwd:d5a493a07b92e452116a851e083e1c78\r\na=ice-ufrag:721f69a3\r\na=mid:audio1\r\na=rtcp-mux\r\na=rtpmap:97 opus/48000/2\r\na=setup:active\r\na=ssrc:3561002322 cname:{bb14ec44-0966-49c0-bccb-5e6242dd83d7}\r\nm=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\nc=IN IP4 0.0.0.0\r\na=sendrecv\r\na=ice-pwd:d5a493a07b92e452116a851e083e1c78\r\na=ice-ufrag:721f69a3\r\na=mid:application2\r\na=setup:active\r\na=sctp-port:5000\r\na=max-message-size:1073741823\r\n"}} ``` which leads to: ``` 0:00:02.007849785 90 0x7fc2a0002030 WARN webrtcsink net/webrtc/src/webrtcsink/imp.rs:3238:gstrswebrtc::webrtcsink::imp::BaseWebRTCSink::handle_sdp_answer: consumer from session 56a17f8d-2585-4d4b-9f2e-3009450a19e9 refused media 0: Some("m=video 0 UDP/TLS/RTP/SAVPF 120\r\nc=IN IP4 0.0.0.0\r\na=inactive\r\na=mid:video0\r\na=rtpmap:120 VP8/90000\r\n") ``` and a connection close.

Why Firefox could respond with VP8 to the H264 request?

Asked by Robert Ayrapetyan 1 week ago

Answered by Robert Ayrapetyan 4 days ago

PDF are often rendered unreadable, with desktop background showing through (screenshot attached)

I often run into issues with PDFs in Firefox Linux. They either appear totally blank (typically after suspend/restore), or they appear with the desktop background showing… (read more)

I often run into issues with PDFs in Firefox Linux. They either appear totally blank (typically after suspend/restore), or they appear with the desktop background showing through (as in the attached screenshot).

Hard refreshing the page doesn't change anything, opening a new tab and opening the PDF again doesn't change anything, opening a new window and loading the PDF doesn't change anything.

The screenshot is with this PDF: https://www.sgsw.ch/home/strom/_jcr_content/Par/sgsw_accordion_list_1838160259/AccordionListPar/sgsw_accordion_12353/AccordionPar/sgsw_downloadlist/DownloadListPar/sgsw_download_1049323524.ocFile/2023-08-31%20Mitteilung%20Elcom%20Erh%C3%B6hung%20Elektrizit%C3%A4tspreise%20f%C3%BCr%20das%20Jahr%202024.pdf

It renders correctly in Chromium.

Firefox 126.0 using the recommended performance settings on Mint 21.3, nvidia quadro p620 using the official nvidia drivers v535.171.04-0ubuntu0.22.04.1

Asked by c+ff 1 week ago

Last reply by jonzn4SUSE 6 days ago

Cannot drag tab to detach it from the current window

After updating to the current version of my OS(listed below) I can no longer drag a tab to detach it from the firefox window. Doing so drags a preview of the tab, but it … (read more)

After updating to the current version of my OS(listed below) I can no longer drag a tab to detach it from the firefox window. Doing so drags a preview of the tab, but it is never separated from the current window. I can drag it to an already existing window to move tabs from one window to another, but not to create a new window from a single tab.

OS: Manjaro Linux 24.0.0 Wynsdey Linux kernel version: 6.6.30-2-MANJARO (64-bit) Desktop Environment: KDE Plasma 6.0.4 KDE Framework version: 6.1.0 QT Version: 6.7.0 Display Server: Wayland Firefox version: 125.0.3 (64-bit)

Asked by Erik H 2 weeks ago

Last reply by jonzn4SUSE 1 week ago

Choppy video on all sites

After SUSE-15.6 updated FIREFOX to 115.11.0esr, all sites show choppy videos. I have no idea why or what I can do to resolve the issue. If someone has an idea, it would… (read more)

After SUSE-15.6 updated FIREFOX to 115.11.0esr, all sites show choppy videos. I have no idea why or what I can do to resolve the issue. If someone has an idea, it would be greatly appreciated

Asked by cllu 1 week ago

Last reply by jonzn4SUSE 1 week ago

DuckDuckGo is down

I use DuckDuckGo for my basic search engine on both my laptop (Ubuntu system) and iPhone 8. It does not work today - saying "There was an error displaying the search resu… (read more)

I use DuckDuckGo for my basic search engine on both my laptop (Ubuntu system) and iPhone 8. It does not work today - saying "There was an error displaying the search results. Please try again.", needless to say...I have tried a number of times and differed the searches to no avail. I also cleared recent cache/history. Still stuck. Searching on Chrome I see on https://news.ycombinator.com/item?id=40451490 that others are also experiencing this problem and do not understand it either - just a few entries

The Sun (a rather populist newspaper in UK) has an article saying it is international and happening today, 23 May 2024, suggests no fixes. (Not exactly a reliable source in my thing)

Has anyone ideas or should I just wait and use an alternative search engine meanwhile? Thanks for any help

Asked by b17m 2 weeks ago

Last reply by James 1 week ago

  • Solved

multi-account containers as part of "home page" tabs - open without confirmation

I've got my "homepage and new windows" setting set up with several "ext+container links so that my selected websites open in their respective containers : e.g. ext+… (read more)

I've got my "homepage and new windows" setting set up with several "ext+container links so that my selected websites open in their respective containers : e.g. ext+container:name=Personal&url=https%3A%2F%2Fwww.facebook.com%2F%3Fsk%3Dh_nor

I open facebook in 2 seperate containers so that I can maintain 2 seperate personalities under facebook - e.g. I am a group admin within one, just a group member in another.

I have 2 urls defined in my "homepage and new windows" setting for these :

ext+container:name=Personal&url=https%3A%2F%2Fwww.facebook.com%2F%3Fsk%3Dh_nor ext+container:name=Facebook&url=https%3A%2F%2Fwww.facebook.com%2F%3Fsk%3Dh_nor

This was working fine without any issues. My sites opened up when I started my web browser and everything.

Recently, firefox has started up but my container tabs do not load automatically, I am getting a confirmation (I will post a screen capture as a comment).

Is there a way to turn this off and just open the tabs without a confirmation?

Asked by geolaw 5 months ago

Answered by zeroknight 5 months ago

  • Solved

Can no longer detach tabs in Firefox 126

Tab detachment was working fine until updating to Firefox 126. Now the tabs cannot be moved, detached or dragged to another window. In about:config, browser.tabs.allowT… (read more)

Tab detachment was working fine until updating to Firefox 126. Now the tabs cannot be moved, detached or dragged to another window.

In about:config, browser.tabs.allowTabDetach is set to true

Suggestions?

Asked by Jeffery Small 2 weeks ago

Answered by Jeffery Small 2 weeks ago

proxy.pac file not loading on startup

Hi, I'm experiencing a problem on Firefox 125 and 126 on Red Hat Linux 8 & 9 and also on Ubuntu 20 and 22 systems. We have a proxy pac which we have tried loading f… (read more)

Hi,

I'm experiencing a problem on Firefox 125 and 126 on Red Hat Linux 8 & 9 and also on Ubuntu 20 and 22 systems.

We have a proxy pac which we have tried loading from an http url, or a local file and both produce the same result.

  • Launch Firefox, no access to Internet sites (i.e. no proxy)
  • Enter settings and Reload proxy pac
  • Proxy works perfectly

Is there any way to force the proxy pac to load on Launch? Why isn't this the default behaviour? or am I doing something wrong?

Thanks

Asked by andy270 2 weeks ago

Firefox Getting Unusuable

Hi, this is going to be a long one, so many things... Using Firefox the latest Ubuntu LTS, with the latest Firefox from Snap. I'm a very long term Firefox user, never had… (read more)

Hi, this is going to be a long one, so many things... Using Firefox the latest Ubuntu LTS, with the latest Firefox from Snap. I'm a very long term Firefox user, never had any real troubles unit recently. I have a vast number of cookies, saved passwords and so on. Reinstalling or deleting cookies or such isn't an option unless fixes are guaranteed to work - if I have to start over then I'll do it with Opera, that is where my grumpiness indicator is at.

The set up is two monitors (working as a single 'screen') attached to an Aspire PC (Aspire X seems to be the model?). I tend to have 'stuff' going on in the left hand monitor, YouTube on the right. The PC is on all day. I know there are log files, but I don't know which is for what or where they are. I use AdBlocker Ultimate.

So what's happening is: Firefox crashes quite often at any time - 'Firefox is not responding - force quit or wait' - always have to quit. There doesn't seem to be any repeatable way to cause this, it seems random.

When the mouse enters the YouTube window (the drawing area, not the actual window) it disappears until the pointer moves out of the window. Jiggling the window size sometimes brings it back, but...

When the mouse pointer actually appears the window is completely unresponsive - clicks don't work, nothing highlights and so on. After somewhere between 10 and 30 seconds things will work for 2 or 3 mouse actions (clicks, drags etc) then do it again. Unless I give it plenty of time, clicking on a video will play a pretty random one - Firefox seems to lose track of where the pointer is.

If I comment on a video the I get about 5 to 10 characters in then nothing happens for 10 to 20 seconds, then any queued characters are shown. Rinse and repeat until the comment is complete - it takes ages.

YouTube is the biggest problem, but there are some glitches in other Firefox windows, I'm supposing that the problems are audio/video related.

None of the above happens with Opera. It's getting to the stage where Firefox is unusable.

I've googled and searched this site but the there seems no solution.

Any help appreciated.

Asked by richardjwatsontsr3 2 weeks ago

PDFs occassionaly become garbled and restarting firefox temporarily fixes it

I view a lot of PDFs for electronics design. And after some time with the browser running it starts to garble PDFs. I have not found a trigger. Sometimes it opens fine in… (read more)

I view a lot of PDFs for electronics design. And after some time with the browser running it starts to garble PDFs. I have not found a trigger. Sometimes it opens fine in a new container tab or private browsing, other times nothing will open it. Very occasionally refreshing a few times makes it load correctly. The error doesn't manifest for all PDFs at the same time. Open ones will remain viewable, and once the error occurs some new PDFs still open while others fail consistently. Sometimes opening the same PDF as a file from my local drive makes it render.

The rendering error is a bit unlike anything I've ever seen. There is a lot of X and Y spearing like it tried to render the same text and images in slightly different spots over and over again. When I switch virtual workspaces and come back some parts of the rendered page retain the contents of the previous workspace and others do not. Scrolling produces jitter and additional smearing.

One somewhat reliable way to trigger the error is to put the laptop to sleep and wake it up. That always causes PDFs to exibit this error but often refreshing the PDF will work to restore it. Not reliably though.

I've attached an image of the error captured with my phone because neither screenshots nor OBS can actually "see" the garbage on screen. Apologies that this error is so full of inconsistent behavior. I've lived with this for some time now in the hopes that it was a temporary problem and tried to work out what causes it but I can't find anything other than putting the laptop to sleep being a cause, and even then it is not the sole cause.

Asked by Colette 🌩️💝 Kerr 2 weeks ago

the amout of search result of "Bing" in same keywords in firefox browser is less than another browser(chrome).Why?

Lately, I used "Bing" in Firefox browser,but it often show no result and give one message about “Missing children". I think this is very strange, so I try to search in … (read more)

Lately, I used "Bing" in Firefox browser,but it often show no result and give one message about “Missing children". I think this is very strange, so I try to search in the "Bing" in different browser(Firefox and Chrome),and the test is confused. when I used this string "益云公益寻儿童" as the keyword for searching, there is only one result in Firefox browser but there are many results in Chrome browser.please see below images ( image 1 and image 2). At the same time ,there are also many results in "Baidu" in Firefox(image 3). Next I changed another keywords"天气预报",but there is still the big difference between them. when I Searching ,I closed all the plugins. So I think this is strongly related to Firefox browser. This phenomena makes "Bing search" very unpredictable so that I often got no result. please help me! thanks.

Asked by vitaecheng 2 weeks ago

firefox browser on face book

Hello when i am on facebook,and i want to do a video chat or a call chat it now tells me that video or voice calling is not supported by this browser,yet it was all worki… (read more)

Hello when i am on facebook,and i want to do a video chat or a call chat it now tells me that video or voice calling is not supported by this browser,yet it was all working fine about a week ago and i went to do a video call two days ago and now i can't,i have no idea what has happened regards mark

Asked by mdk308 2 weeks ago