On Aug 14th 11 PM ET/Aug 15th 03:00 UTC, due to scheduled Firefox Account server maintenance, users may not be able to sign in or create a new subscription. This is expected to last approximately 30 minutes. Status updates can be found at https://status.vpn.mozilla.org or https://status.relay.firefox.com.

Search Support

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

Another program can't open Firefox

more options

When I look up the error message I get, everyone I see who got it can't open Firefox, but I can open it fine. For me, I have Firefox as my default browser and when another program (tModLoader on Steam) tries to open it, it gives me "Profile Missing," "Your Firefox profile cannot be loaded. It may be missing or inaccessible." I don't know if it gives the same error for other programs because I can't think of any programs that open my default browser. When I switch my default browser to Edge, the program can open Edge fine.

When I look up the error message I get, everyone I see who got it can't open Firefox, but I can open it fine. For me, I have Firefox as my default browser and when another program (tModLoader on Steam) tries to open it, it gives me "Profile Missing," "Your Firefox profile cannot be loaded. It may be missing or inaccessible." I don't know if it gives the same error for other programs because I can't think of any programs that open my default browser. When I switch my default browser to Edge, the program can open Edge fine.
Attached screenshots

Chosen solution

it's probably a problem with the program itself

Read this answer in context 👍 0

All Replies (4)

more options

This happens if you have deleted the profile folder or this profile got missing otherwise and the folder marked in profiles.ini as default=1 is no longer present.

Helpful?

more options

it seems like i have all my profiles when i look at the profile manager and the path of the default profile seems to match, but when the program tries to open it it still gives the error.

a weird thing is that firefox can open itself just fine but when the other program tries to open it it gets the error. is there something the program could be doing wrong?

i just tested it on Discord and discord seems to be able to open it fine, but this specific program give the error for firefox

Modified by Good_Days13

Helpful?

more options

Chosen Solution

it's probably a problem with the program itself

Helpful?

more options

It would be interesting to know what Steam is actually sending Windows. As a possible roundabout way to discover that:

Open the Windows Task Manager (Ctrl+Shift+Esc), show More Details if needed, and switch to the Details tab.

Add the Command Line column (right-click any column to bring up a list of columns available). Then click the Command Line column heading to sort using that column, and scroll down to the Firefox lines. Let your eyes adjust for a moment... Typically the command lines looks like the one of these:

  • Original startup process in default profile: "C:\Program Files\Mozilla Firefox\firefox.exe"
  • External link/URL shortcut: "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url https://example.com
  • Child process launched by Firefox: "C:\Program Files\Mozilla Firefox\firefox.exe" -content-proc [many parameters]

Keeping the Task Manager open, switch over to Steam to trigger the error.

Then after the error message appears, don't close it, but switch back to the Task Manager and see whether you can spot anything unusual about the new command line, for example, not being the same program path, or using an unusual command-line parameter.

Helpful?

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.