Turn off all or most of:
browser.translations.select.enable– Removes the "Translate Selection" button from the right-click menu.screenshots.browser.component.enabled– Disables the built-in Firefox screenshot functionality, which also removes the "Take Screenshot" button.dom.text_fragments.enabled– Disables Text Fragments support, which also removes the "Copy Link to Highlight" button (and disables the auto-focus on URLs that include #:~:text=...). Don’t want to remove this functionality? See my next post.privacy.query_stripping.strip_on_share.enabled– Removes the "Copy Clean Link" / "Copy Clean Link to Highlight" buttons.devtools.accessibility.enabled– Disables the DevTools Accessibility Inspector and removes the "Inspect Accessibility Properties" button.browser.ml.chat.menu– Removes the "Ask an AI Chatbot" button.browser.ml.linkPreview.enabled– Disables Link Previews (and the AI-generated key points inside them), removing "Preview Link" button.dom.text-recognition.enabled– Disables OCR on images, removing the "Copy Text From Image" button.browser.search.visualSearch.featureGate– Disables Visual Search (Google Lens integration) and removes "Search Image with Google Lens" button.extensions.formautofill.addresses.enabled– Disables address autofill and the associated menu/button that sometimes appears in forms.extensions.formautofill.creditCards.enabled– Disables credit card/payment method autofill and removes the associated menu/button that sometimes appears in forms.widget.macos.native-context-menus– Turns off native macOS context menus so Firefox uses its own menus. This removes the "Services" button.print.enabled– turn off the entire print menu.
I leave the formautofill, print and dev inspect accessibility, switched on, ymmv.