Can't fork the fork of a repo I have already forked

[regiogate]

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I want to work on two browser extensions (one for Chrome, the other for Firefox). One of them is a fork of the other.
I had no problems creating a fork of the primary repo (the one for Chrome), but when I try to create a fork of the Firefox version I get the following message: No available destinations to fork this repository.
Below that is a link to my fork of the Chrome extension.

I want to extend both with some functionality we need internally in our company.

Firefox: https://github.com/BrianGilbert/xdebug-helper-for-firefox
Chrome: https://github.com/mac-cain13/xdebug-helper-for-chrome

Since what I need to do is slightly different for each one it has to be done in two separate repositories. Since the changes are for internal use only there will be no pull requests made, all I want is to receive upstream changes.

[iSemary]

I think you can’t fork a repo that you’ve already forked before!

if not then make sure that the fork option of this repository is enabled

Wish it could help you!

[regiogate]

I can't imagine that I'm blocked since I had no interaction with the repo owner so far. Others have forked the Firefox extension, so forking it is allowed in general. How can I check for either of these issues?
Since the error message includes a link to my fork of the Chrome version I'm quite sure that it has to do with that, but I don't understand why it happens and what I can do to solve the issue.

[iSemary]

I found that GitHub interface doesn't provide a direct way to fork a forked repository from the web application, you have to fork it with upstream from the terminal like this steps after cloning the firefox repo :

git remote add upstream https://github.com/BrianGilbert/xdebug-helper-for-firefox.git
git fetch upstream
git checkout -b branch-name upstream/main

and try to push this change

Hopefully it work with you!

[regiogate]

Forking the Firefox repo actually works from another account using the GitHub interface, so it's not the fact that it is a fork itself.
Just that I already have a fork of it's parent repo.
Your suggestion means that I create the fork locally on my machine, right? While that would work I wanted to have it in our GitHub so all our developers can work with that repo.
But if GitHub for some reason just doesn't allow that we'll have to do it differently. I just would like to understand the reason for this limitation.

Anyway, thanks a lot for all your effort so far! I'm new to GitHub and eager to learn.

[iSemary]

The suggestion i wrote if it worked, It will be available to other developers to work with it if you pushed the repo from your local to your account.
Give it a try I think it should work with you!
You're welcome! Anytime !

[regiogate]

Ok, I tried to follow your steps. But honestly I'm not sure I know what I'm doing...
I created a new repository on GitHub by cloning the firefox repo.
Then I cloned my new GitHub repo to my local computer.
There I executed the commands you listed above. As branch-name in the checkout command I gave "up". Output:
Switched to a new branch 'up'
branch 'up' set up to track 'upstream/main'.
Did I do everything right so far?
Next I did "git push origin" and the up branch showed up on my GitHub, telling me that this branch is up to date with upstream main.
Looks good to me. So if there is a change to the upstream repo I expect to get informed and have the opportunity to merge these changes into my branch, right?
Can I set it up so that all this works on the main branch instead of the up branch? Does that even make sense?

Again, thanks a lot for your help!

[kuchaguangjie]

Got the same issue, I can create a new repo by hand, clone from other's repo, then push to my own repo.
But the 2 repo are not related in github's ui, though I can pull/merge locally using git commands.

[kuchaguangjie]

Does Solution 2 work ? Seems not.

[Chinh-Johnson]

For my case, I can't fork a repository that I already forked a fork of it.
Is the only option manually create new repo?