[sesnut]

browser no longer opens when set via advanced settings.
clicking open browser when the dialog pops up does nothing either.
Default browser opens normally when set to null

[Jiaz]

Please set your browser as default browser again.
In case this does not help, you can manually set the browser yourself , see
https://board.jdownloader.org/showpo...29&postcount=3
In case you're on Mac, see some posts below for how to set it on Mac

[sesnut]

I didnt change anything, it just stopped working

It was working before and now it doesnt

[Jiaz]

Did you reset the browser as default as I suggested?
In case it still doesn't work, just setup the path yourself in settings as linked

[sesnut]

it opens the default browser if I set it to default, but I want it to open a different browser
If I clear it and redo the setting it still doesn't open the browser in the command line

[sesnut]

I dont know why you marked it as solved either
The problem isnt fixed.
I know how to set the command line and format it correctly and it use to work but now it doesn't and I didnt change anything

[Jiaz]

There have been no changes in JDownloader and the fact that the default browser works, shows that this is no JDownloader issue.
So it looks like there is a misstake in the customized command line. Maybe changed path/variable/binary name?
Can you please provide the value that you pasted into advanced settings?

[sesnut]

[ "C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe", "%s" ]

[Jiaz]

Path is still valid? Maybe there has been an update to firefox and changed from 32 to 64 bit?
If you want we can take a look at this together via Teamviewer.

You can check different tool, for example notepad and check if JDownloader is able to open that one?
Firewall/AV may also cause issue that JDownloader is not able to start another process