Removing Firefox context menu items (right-click menu)

I. Problem:
Remove or hide specific items from Firefox context menu (right-click menu), such as:

• "Take Screenshot"
• "Inspect"
• "Inspect Accessibility Properties"
• "View Page Source"
• "Select All"
• "Ask AI"
• "Print Selection"
• "Translate Selection"
• "View Selection Source".

II. Solution:

• Use Firefox's about:config settings to disable certain features entirely
or
• Use userChrome.css to hide individual menu items via CSS rules.

III. Instruction:

• Open Firefox and go to about:profiles.

• Find the user profile which is marked as "This is the profile in use and it cannot be deleted."
Click Open Directory next to Root Directory.

• In the profile folder, create a folder named chrome if it doesn't exist.

• Inside chrome, create or edit a file named userChrome.css.

• To disable context menu items you consider unnecessary, edit the userChrome.css file:

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

/* Hide "Take Screenshot" */
#context-screenshot {
  display: none !important;
}

/* Hide "Inspect" */
#context-inspect {
  display: none !important;
}

/* Hide "Inspect Accessibility Properties" */
#context-inspect-a11y {
  display: none !important;
}

/* Hide "View Page Source" */
#context-viewsource {
  display: none !important;
}

/* Hide "Select All" */
#context-selectall {
  display: none !important;
}

/* Hide "Print Selection" */
#context-print-selection {
  display: none !important;
}

/* Hide "Translate Selection" */
#context-translate-selection {
  display: none !important;
}

/* Hide "View Selection Source" */
#context-viewpartialsource-selection {
  display: none !important;
}

With this done, you have hidden menu items by adding multiple custom CSS rules.

• In Firefox open new tab with the address about:config.

• Find the toolkit.legacyUserProfileCustomizations.stylesheets flag and set it to true.

• Restart Firefox completely.

IV. Result:

• After applying these settings and restarting Firefox, the specified context menu items will be removed or hidden as requested.

• Disabling features via about:config completely removes their functionality and menu items.

• Using userChrome.css allows selective hiding of menu items without disabling the underlying feature.

• This provides flexible control over Firefox's context menu appearance.

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You may also like the second, more tough, way to exclude menu items by disabling entire features, which removes corresponding menu items automatically:

• To disable screenshots feature (removes "Take Screenshot"), change screenshots.browser.component.enabled to false in about:config.

• To disable "Ask ChatGPT" menu item, change browser.ml.chat.enabled and browser.ml.chat.shortcuts to false in about:config.

• To disable accessibility tools (removes "Inspect Accessibility Properties"), change devtools.accessibility.enabled to false.