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There are five specific settings I want to set. But I want to leave all the other settings unchanged since different users have different settings.
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There are five specific settings I want to set. But I want to leave all the other settings unchanged since different users have different settings.

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Settings from <i>user.js</i> will override the chosen settings <b>only</b>.<br />
All other user settings will remain intact.
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Settings from user.js will override the chosen settings only.
All other user settings will remain intact.

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But bear in mind that such method is considered user-hostile as it states here:<br />
<a href="https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences" rel="ugc nofollow">https://developer.mozilla.<wbr />org/en-US/<wbr />docs/Mozil<wbr />la/Prefere<wbr />nces/A_bri<wbr />ef_guide_t<wbr />o_Mozilla_<wbr />preference<wbr />s</a>
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But bear in mind that such method is considered user-hostile as it states here:
https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences [https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences]

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The latest version of Firefox has several changes that are causing headaches for many of my clients. I’ve managed to resolve these problems via changes in <b>Options</b> or going through <b>about:config</b>. <br />
<br />
I’m looking for a quick way to deploy these changes so that I don’t have to do all the steps manually on every PC. <br />
<br />
Do any of you know a quick way to deploy updates to Firefox settings so that I could make a file with just specific updates and all their other settings would be unaffected?<br />
<br />
The clients are from a variety of companies that I support so they aren't all on the same network. Very few of them are even on a domain, so there's no way to centrally roll out updates.<br />
<br />
Thanks in advance.
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The latest version of Firefox has several changes that are causing headaches for many of my clients. I’ve managed to resolve these problems via changes in Options or going through about:config. 

I’m looking for a quick way to deploy these changes so that I don’t have to do all the steps manually on every PC. 

Do any of you know a quick way to deploy updates to Firefox settings so that I could make a file with just specific updates and all their other settings would be unaffected?

The clients are from a variety of companies that I support so they aren't all on the same network. Very few of them are even on a domain, so there's no way to centrally roll out updates.

Thanks in advance.

Deploy updates to Firefox settings

Mozilla Firefox is a free and open-source web browser developed by Mozilla Foundation. It is available for use on Windows, macOS, Linux, and BSD operating systems.

Firefox

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.