Customize the start-page of firefox

I want to know how I can customize the start-up page of my firefox. For start-up page, I am talking about the page shown defaultly as I run the firefox.exe on my windows system and not talking about the home page set by a user(for e.g., if google.com set as home page for firefox).
I am not very sure what to call that page as, thus referring it as startup-page for the browser. Also attaching the snapshot for the page which I want to customize, just to clear the confusion, if any.
I want to make the changes only on my local computer, and as firefox is open source, hope its not illegitimate to do so. Kindly let me know how I can do this, if possible.
Thankyou

cor-el posted the "location" of the default homepage - in the '''omni.ja''' file within the Firefox program files folder. I can't tell anything more specific as I haven't been the omni.ja file since it was "new" in Firefox 4.0.
omni.ja gets updated with every Firefox version update - so you'll lose whatever changes you made every 6 weeks ''or possibly sooner with a "chemspill" security update. Which is why I learned to do minor changes with userChrome or userContent css file instead.''

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How do I customize the error pages in Firefox 24?

I'd like to customize the HTLM/CSS/JavaScript of all the Firefox 24 error pages, i.e. the network connectivity lost, DNS and other standard error pages.

Hello ekan,
This can be done, but you're going to need to get pretty dirty to get it done. Ready?
First, learn about userContent.css:
http://kb.mozillazine.org/UserContent.css
http://kb.mozillazine.org/Profile_folder
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Open the netError.css file in Wordpad (Notepad doesn't seem to work for me because then the lines all run together). See all the code that starts with the # symbol? Those are the things you can easily change. Copy all the #ELEMENT code into your userContent.css file.
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CODE: SELECT ALL
#errorPageContainer {
-moz-border-radius: 0px !important;
background-color: red !important;
That should make the box that surrounds the error message be red with square corners instead of white with a rounded corner border. Remember that before every semi-colon, you need to put !important or the change won't do anything.

How to set a New Tab as the start page in Firefox and lock in my choice of web sites

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If this is something in Windows and the about:newtab page in Firefox then make sure that those tiles use the default browser and that Firefox is set correctly as the default browser.
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*https://developer.mozilla.org/Command_Line_Options
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observed on:
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OLD VALUE: https://snippets.mozilla.com/%STARTPAGE_VERSION%/%NAME%/%VERSION%/%APPBUILDID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/
NEW VALUE: (blank)
- I deleted the folder \storage\persistent\moz-safe-about+home under the Profile directory
Actual folder name on WINDOWS XP:
C:\Documents and Settings\<USERNAME>\Application Data\Mozilla\Firefox\Profiles\<PROFILENAME>\storage\persistent\moz-safe-about+home
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Hey Revert back changes (if you don't like) via settings on right top side . Also send a related image so we gave you exact info about the settings. You can Shut automatic updates (but it may leads some issues) via
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Do you have an orange Firefox button in the upper left, or do you have the customary menu bar (File, Edit, View, etc.)?
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How can I stop the little pictures (icons??) and the firefox ball from bouncing all around the middle of the start page, which is my home page (?) It's VERY ANNOYING and DISTRACTING!

If you prefer not to see snippets on the about:home page then you can set the browser.aboutHomeSnippets.updateUrl pref to an empty string on the about:config page.
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You can set Firefox home page to one of your choosing, see [[how to set the home page]].
If the keep me signed in option is not working, you may have a malformed cookie. Try deleting Google/Gmail cookies, for details on how to do that see [[deleting cookies]].

Customize the start-page of firefox

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