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How do I make Firefox OPEN in Full Screen?

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I know how to change browser size, but how do I get Firefox to open in a large window, instead of a 2 inch space I have make larger, manually?

I know how to change browser size, but how do I get Firefox to open in a large window, instead of a 2 inch space I have make larger, manually?

All Replies (6)

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Firefox should open with the size of the window that you last closed it with.
This setting is stored in the localstore.rdf file, so you can check for issues with this file if the is not the case.

See:

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I tried. didn't do anything. I'm a newbie, I'll deal with it when I am more knowlegable. Thank you

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What are the screen dimensions if you open the localstore.rdf file in a text editor (e.g. Notepad) and search for browser.xul#main-window?

  • chrome://browser/content/browser.xul#main-window

You can use this button to go to the currently used Firefox profile folder:

  • Help > Troubleshooting Information > Profile Director: Show Folder (Linux: Open Director; Mac: Show in Finder)
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I found this part...

<RDF:RDF xmlns:NC="http://home.netscape.com/NC-rdf#"

        xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
 <RDF:Description RDF:about="chrome://mozapps/content/downloads/unknownContentType.xul">
   <NC:persist RDF:resource="chrome://mozapps/content/downloads/unknownContentType.xul#unknownContentType"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/setDesktopBackground.xul#menuPosition"
                  value="CENTER" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#urlbar-container"
                  width="467" />
 <RDF:Description RDF:about="chrome://browser/content/preferences/preferences.xul">
   <NC:persist RDF:resource="chrome://browser/content/preferences/preferences.xul#BrowserPreferences"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#toolbar-menubar"
                  autohide="false"
                  currentset="menubar-items"
                  mode="icons" />
 <RDF:Description RDF:about="place:folder=TOOLBAR&excludeItems=1&expandQueries=0"
                  NC:open="true" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentTags"
                  ordinal="3"
                  width="77" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#addon-bar"
                  currentset="addonbar-closebutton,spring,status-bar"
                  mode="icons"
                  collapsed="true" />
 <RDF:Description RDF:about="chrome://browser/content/setDesktopBackground.xul">
   <NC:persist RDF:resource="chrome://browser/content/setDesktopBackground.xul#menuPosition"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#main-window"
                  width="1366"
                  sizemode="normal"
                  screenY="21"
                  height="692"
                  screenX="0" />
 <RDF:Description RDF:about="place:folder=BOOKMARKS_MENU&excludeItems=1&expandQueries=0"
                  NC:open="true" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul">
   <NC:persist RDF:resource="chrome://browser/content/

"/>

   <NC:persist RDF:resource="chrome://browser/content/browser.xul#sidebar-box"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#sidebar-title"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#toolbar-menubar"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#nav-bar"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#PersonalToolbar"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#addon-bar"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#urlbar-container"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#search-container"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#TabsToolbar"/>
   <NC:persist RDF:resource="chrome://browser/content/browser.xul#navigator-toolbox"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentLastModified"
                  ordinal="17" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#PersonalToolbar"
                  collapsed="true"
                  currentset="personal-bookmarks"
                  mode="icons" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentDate"
                  ordinal="7"
                  hidden="false"
                  width="112" />
 <RDF:Description RDF:about="chrome://global/content/customizeToolbar.xul#CustomizeToolbarWindow"
                  width="568"
                  height="471" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentTitle"
                  width="111" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#nav-bar"
                  collapsed="false"
                  iconsize="large"
                  mode="icons"
                  currentset="unified-back-forward-button,urlbar-container,reload-button,stop-button,search-container,webrtc-status-button,bookmarks-menu-button,downloads-button,home-button,window-controls,social-share-button" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentVisitCount"
                  ordinal="9"
                  hidden="false"
                  width="103" />
 <RDF:Description RDF:about="chrome://mozapps/content/handling/dialog.xul">
   <NC:persist RDF:resource="chrome://mozapps/content/handling/dialog.xul#handling"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul">
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentTags"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentUrl"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentDate"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentVisitCount"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentKeyword"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentDescription"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentDateAdded"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentLastModified"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#placesContentTitle"/>
   <NC:persist RDF:resource="chrome://browser/content/places/places.xul#places"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentKeyword"
                  ordinal="11" />
 <RDF:Description RDF:about="place:folder=UNFILED_BOOKMARKS&queryType=1"
                  NC:open="true" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#search-container"
                  width="775" />
 <RDF:Description RDF:about="chrome://global/content/customizeToolbar.xul">
   <NC:persist RDF:resource="chrome://global/content/customizeToolbar.xul#CustomizeToolbarWindow"/>
 </RDF:Description>
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#sidebar-title"
                  value="" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#places"
                  screenX="10"
                  screenY="10"
                  width="700"
                  height="500"
                  sizemode="normal" />
 <RDF:Description RDF:about="chrome://browser/content/preferences/preferences.xul#BrowserPreferences"
                  screenX="53"
                  screenY="76"
                  lastSelected="paneAdvanced" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentUrl"
                  ordinal="5"
                  width="80" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#sidebar-box"
                  src="chrome://browser/content/history/history-panel.xul"
                  sidebarcommand="" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentDateAdded"
                  ordinal="15" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#TabsToolbar"
                  currentset="tabbrowser-tabs,new-tab-button,alltabs-button,tabs-closebutton" />
 <RDF:Description RDF:about="chrome://mozapps/content/handling/dialog.xul#handling"
                  screenX="519"
                  screenY="188"
                  width="328"
                  height="351" />
 <RDF:Description RDF:about="place:folder=22&excludeItems=1&expandQueries=0"
                  NC:open="true" />
 <RDF:Description RDF:about="place:folder=29&excludeItems=1&expandQueries=0"
                  NC:open="true" />
 <RDF:Description RDF:about="chrome://mozapps/content/downloads/unknownContentType.xul#unknownContentType"
                  screenX="707"
                  screenY="369" />
 <RDF:Description RDF:about="chrome://browser/content/places/places.xul#placesContentDescription"
                  ordinal="13" />
 <RDF:Description RDF:about="chrome://browser/content/browser.xul#navigator-toolbox"
                  iconsize="large"
                  mode="icons" />

</RDF:RDF>


and I think i saw: browser.xul#main-window

didn't see anything about dimensions.

BTW~If I'm in Firefox, why does 90% refer to chrome?

Thank You

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You can simply use F11 to open it in Full Screen mode.

Hope this helps.

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There is a height (692) and width (1366) specified:

 <RDF:Description RDF:about="chrome://browser/content/browser.xul#main-window"
                  width="1366"
                  sizemode="normal"
                  screenY="21"
                  height="692"
                  screenX="0" />