Created 3.4 Apply + Update + Maintain (markdown)

3.4-Apply---Update---Maintain.md

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+🟩 Previous: [Overrides [To RFP or Not]](https://github.com/arkenfox/user.js/wiki/3.3-Overrides-[To-RFP-or-Not])
+
+🟥 Summary: **We do not need one**
+
+---
+
+🟪 APPLY
+
+If you are not using a new profile, we recommend running our [cleanup script](https://github.com/arkenfox/user.js/tree/master/scratchpad-scripts), the instructions are in the file
+
+🔹 Put all the relevant files into the root folder of your profile <sup>[1]</sup>
+  - `prefsCleaner`
+  - `updater`
+  - `user.js`
+  - `user-overrides.js` (which you created)
+
+Continue with the UPDATE part below
+
+[1] To find your profile, open `about:support` and look for `Profile Folder` under `Application Basics`
+
+🟪  UPDATE
+
+- 🔹 run the updater
+   - so the contents of your `user-overrides.js` is appended to the `user.js`
+- 🔹 ALWAYS run prefsCleaner
+   - make sure Firefox is closed
+   - this will reset prefs that aren't needed or can cause issues, as well as keep things clean and tidy
+   - you can read more about prefsCleaner next
+
+🟪  MAINTAIN
+
+Starting with v97, arkenfox changes to the live master will happen once per release: all changes will be done in a separate branch and only merged when finished. I cannot guarantee when I will release each one - hopefully within a week of the Firefox release. Virtually nothing changes these days that will affect you in that time delay.
+
+So ... once a release ... check for the latest [changelog](https://github.com/arkenfox/user.js/issues?utf8=✓&q=is%3Aissue+label%3Achangelog), run the updater, and run prefsCleaner (with Firefox closed)
+
+---
+
+🟩 Next: [prefsCleaner](https://github.com/arkenfox/user.js/wiki/3.5-prefsCleaner)