Minor Steps to reproduce:
1. Install Jenkins 1.554.1 via official Jenkins repo on Ubuntu 13.10 (distro is most likely unrelated anyway).
2. Enable security either with Active Directory or with Jenkins' own user database (prolly occurs with other methods, too). Make sure that Markup Formatter is set to Raw HTML.
3. Login with a user.
4. Create a new freestyle job. Check "This build is parameterized", add a String or Boolean parameter with any name and save the job.
5. Go back to job configuration and delete the parameter.
Symptom:
When you click "Delete" the parameter disappears as it should, but when you click either on Apply or Save nothing happens. All you can do is navigate to somewhere else but when you return to this job the parameter will be there again.
Workaround:
Change markup formatter to Escaped HTML.
- duplicates
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JENKINS-22275 Save of job configuration doesn't work after removing a parameter under 'This build is parameterized'
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- Resolved
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[JENKINS-23038] Cannot delete certain job parameters
We've noticed a different behaviour according to the browser used. Tested with Chrome 20 et 32 and Mozilla ESR 17 and 24 => mozilla displays an error modal window.
Additional note: works correctly using Firefox Aurora "30.0a2 (2014-04-22)".
Viktor Berke
added a comment - In Firefox 29/30/31 the Save button works but Apply throws an empty grey Error window. If you press Apply, close the Error window and then press Save, it opens the main job page on a new tab and deletes the parameter at the same time. Quite strange.
Viktor Berke
added a comment - In Firefox 29/30/31 the Save button works but Apply throws an empty grey Error window. If you press Apply, close the Error window and then press Save, it opens the main job page on a new tab and deletes the parameter at the same time. Quite strange. 
Same issue. Thanks for the workaround.