Mozilla Monitor website will be down for 2 hours starting 5/20/2025 at 6 AM PT. Visit our status site for updates.

Avatar for Username

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

How do I edit my .js file?

pam.butler24
pam.butler24

I need to add four lines, so that I can copy and paste, but when I open my .js file it won't let me. How do I add these four lines?

I need to add four lines, so that I can copy and paste, but when I open my .js file it won't let me. How do I add these four lines?

Chosen solution

Open js files in a text program like WordPad. Notepad doesn't usually do line wrap and make it harder to edit. And make sure that you don't disrupt for formatting of that file.

Read this answer in context 👍 0

All Replies (3)

the-edmeister
the-edmeister
  • Moderator

Chosen Solution

Open js files in a text program like WordPad. Notepad doesn't usually do line wrap and make it harder to edit. And make sure that you don't disrupt for formatting of that file.

cor-el
cor-el
  • Moderator

What .js file are you talking about?

Is this about .js files in the Firefox profile folder?

Is this about adding pref lines to prefs.js or user.js?

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor

Hi pam.butler24, if you are thinking of editing the prefs.js file (or a user.js file), that may not be what you want. Those changes are intended to provide websites permission to read and modify your clipboard. That shouldn't be necessary to use standard commands.

By standard commands, I mean:

  • right-click > Copy -or- Ctrl+c
  • right-click > Paste -or- Ctrl+v

If those commands are not working on a particular site, do you want to mention which one it is and which methods you've tried?

Also, if this is related to YouTube or Facebook, have you changed this setting in about:config:

dom.event.clipboardevents.enabled

That can have unexpected consequences.