Firefox Community Forum

On my windows PC, I am unable to view Ring Camera live-view due to "error missing required codec". Does my Firefox have the required HEVC codec to view Ring Camera videos?

Does anybody know which options to use on the command-line start of Firefox such that the only thing displayed is the area within which an HTML page would be presented?

I want to have it start with everything else turned off or hidden, namely

   memu bar
   page tabs bar
   address bar along all add-on buttons
   bookmarks sidebar

The "-kiosk" option is not appropriate for my needs.

-kiosk doesn't hide the sidebar (Bookmarks or not) if that sidebar was visible during last session before exit ... so ... no, "-kiosk" is not a proper implementation of a "page-only" display mode.

"-private-window" gives no benefit, display-wise, over and above what the "-new-window" option provides.

Everything I've read (even on the Mozilla support site) seems to point to creating a special profile for just that mode, and then to modify the "userChrome.css" file with custom properties to ensure the desired "off" setting for the GUI elements. That seems a rather "small-minded" view, ignoring the potential for huge market of self-contained hard-coded applications that would need only use the Firefox rendering engine, and nothing else!

One comment on Reddit indicated that the functionality was there ("-app" option working with XULrunner), but discontinued!

As a test, I did close all my browsers, leaving the bookmark sidebar visible before closing. I then entered:

firefox -kiosk -safe-mode -private-window ${URL}

I still get the bookmark-sidebar visible, with everything else "hidden" or "disabled", because visible sidebar is my default mode for normal browsing.

Is there no command-line startup switch to force that sidebar to "hide", equivalent to clicking on the "X" on the top-right corner?

OR ...

Is there any programmatic way to tell that to hide using JavaScript in the HTML page that is loaded? Everything I seem to locate refer to in-page Elements only, not Browser Elements. :frowning:

But "kiosk"(fullscreen-mode) is not the mode I want, because I want users to be able to have the simplified browser-based HTML App co-exist on the desktop with other windows, like a normal App.

• • Basic HTML test page** *(myHtmlGame.html)* **:**

``` <meta charset="UTF-8"> <title>myHtmlGame.html</title> <link href="myHtmlGame_bookmarks.css" rel="stylesheet" type="text/css"> <script src="myHtmlGame_bookmarks.js" type="text/javascript"> </script>

• • Basic Javascript file** (*myHtmlGame_bookmarks.js*) **:**

```

// REF: https://stackoverflow.com/questions/1690002/how-can-i-prevent-firefox-showing-my-extensions-sidebar-on-startup var current = this;

var quitObserver = {

  QueryInterface: function(aIID) {
     if (aIID.equals(Components.interfaces.nsIObserver) || aIID.equals(Components.interfaces.nsISupports)) {
        return this;
     }
     throw Components.results.NS_NOINTERFACE;
  },
  observe: function(aSubject,aTopic,aData ) {
     var mainWindow = current._windowMediator.getMostRecentWindow("navigator:browser");
     var sidebar  = mainWindow.document.getElementById("sidebar");
     if (sidebar.contentWindow.location.href == "chrome://daisy/content/sidebar.xul") {
        mainWindow.toggleSidebar('openDaisySidebar', false);
     }
  }

};

setTimeout(function() {

  var mainWindow = current._windowMediator.getMostRecentWindow("navigator:browser");
  var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
  observerService.addObserver(quitObserver,"quit-application-granted",false);

},2000); ```

I've tried using this alternative content for the JavaScript file, but that also failed (using '*hideSidebarBookmarks()*' call in the in-line script segment):

``` function hideSidebarBookmarks() { const sidebar = document.getElementById("CustomizableUI.AREA_BOOKMARKS") ; sidebar.hide() ; } ```

I even tried replacing the word "document" with "browser" in the above, still with no success. :-(

• • Startup command :**

``` firefox -new-window ./myHtmlGame.html & ```

• • Basic CSS file** *(myHtmlGame_bookmarks.css)* **:**

``` html { font-size: 14px ; font-family: "Liberation Sans", "Aileron", "Archivo", FreeSerif, serif ; line-height: 1.2em ; }

body { display: block ; background-color: #1F1F1F ; color: #FF0000 ;

margin-top: 0 ; margin-right: 0 ; margin-bottom: 0 ; margin-left: 0 ; }

/*

************************************************************************
*/

.game-grid { display: grid ; grid-template-columns: 300px 300px 60px ; grid-template-rows: 40px 300px 150px ; }

.game-item-1 { grid-column: 1 / span 3 ; grid-row: 1 / span 1 ; border: 1px solid #8FCF8F ; background-color: #1F1F1F ; }

.game-item-2 { grid-column: 3 / span 1 ; grid-row: 2 / span 2 ; border: 1px solid #8FCF8F ; background-color: #1F1F1F ; }

.game-item-3 { grid-column: 1 / span 2 ; grid-row: 2 / span 1 ; border: 1px solid #8FCF8F ; background-color: #1F1F1F ; }

.game-item-4 { grid-column: 1 / span 1 ; grid-row: 3 / span 1 ; /* box-sizing: border-box ; */ border: 1px solid #8FCF8F ; background-color: #1F1F1F ;

padding-left: 3 em ;

display: block ; color: #FFCF4F ;

word-wrap: break-word ; /* overflow-y: scroll ; overflow-y: auto ; */ overflow-anchor: none ; scrollbar-color: grey-black ; scrollbar-width: thin ; scroll-padding-bottom: 20px ;

/* In case you need to kick off effect immediately, this plus JS */ /* height: 100.001vh ; */ }

.game-item-5 { grid-column: 2 / span 1 ; grid-row: 3 / span 1 ; border: 1px solid #8FCF8F ; background-color: #1F1F1F ; }

div { padding-top: 1 em ; padding-right: 0 ; padding-bottom: 1 em ; padding-left: 0 ; }

```

The above will display per the attached image.

I have a different theme and cursor on my system. I would like to include them in Zen Browser. They are Candy Mac and Azenis respectively. There is no setting to do this. Many other browsers have System themes as an option.

Hello! I have multiple issues with Firefox after YEARS and YEARS of usage.

1) There is always a problem logging into sites that require captcha. This started happening a few months ago. So sites will not open in Firefox, but there's no problem with using Chrome.

2) All of a sudden, when I open and download PDFs from websites, the documents are black. I've gone in and disabled dark theme, but that hasn't made a difference. Again, this is a Firefox issue because it doesn't happen when I'm using Chrome.

Hoping you can help me with both issues. Thanks much!

Hallo, ich habe im Zusammenhang mit dem Übergang zu Windows 11 das Office 2024 Pro installiert. Dabei haben sich zwei Probleme gezeigt: 1. Für das versenden von Links mit Emails habe ich in den Einstellungen "Allgemein" unter "Anwendungen.mailto" das Programm OUTLOOK (classic) in beiden von mir genutzten lokalen Konten zugewiesen. In einem der beiden Konten wird im Gegensatz zu dieser Einstellung immer zu der Aufforderung zur Verbindungsaufnahme mit einem Microsoft-Konto verlangt. Zu einer Anzeige des Outlook-Sendefensters kommt es nicht. Welche Ursache kann es dafür geben und wie kann ich das Problem beheben? 2. Wie in dem beigefügten Bild dargestellt, erscheint bei der Nutzung der mailto-Funktion in beiden lokalen Konten diese Fehlermeldung, die bei normaler Nutzung von Outlook nicht auftritt. Meine Internet-Recherche zu dieser Fehlermeldung hat leider nichts greifbares ergeben. Könnt Ihr mir weiterhelfen? MfG, R. Ziegler.

My Mozilla language is still in mandarin. even i change my region to Pakistan and in language preferences i chooses English US and remove Chinese but still when i search webpage and everything in Mozilla is Chinese language.

Some how my info is all gone and nothing works including any of help suggestions.

I don't think this is even firefox it is more like msn. I keep downloading Firefox and it crashes. I don't know how to fix any of this. I can't even get to see how firefox has looked since maybe 2001. My upper toolbar is all different. It is all wrong and I can't find my hundreds of book marks are all gone.

I can see maybe 10 bookmarks but not from firefox.

I run Windows 10 pro. I have FF 135.0

All my Firefox tabs in the systray stay connected. That is, I can not move them to where I want them on the systray.

How do I disconnect them?

Using firefox developer edition for past 1 year now, but now with recent update in the debugger tab it says "This page has no sources" even not showing html source code. but when searching for something using find in all files(Shift + Cmd + F ) it showing the files. it's kind of difficult for me to debug the javascript and see the html source.

Technical details: software - firefox developer edition - version 136.0b6 os - mac

Hello, I can not longer copy and paste to outlook from other sites. They recommended to check my browser permissions. How do I do this for this issue. It started after my last update. Thanks bunches