Issue

Using Firefox, some actions are triggering twice.
For instance:

• clicking on build with parameter for a job using a file parameter can trigger two builds.
• uploading a plugin in the plugin manager results in it being uploaded twice (and the second upload failing).

Environment

• CloudBees CI (CloudBees Core) on modern cloud platforms - Managed Master > 2.176.x

• CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center > 2.176.x

• CloudBees CI (CloudBees Core) on traditional platforms - Client Master > 2.176.x

• CloudBees CI (CloudBees Core) on traditional platforms - Operations Center > 2.176.x

• CloudBees Jenkins Enterprise - Managed Master > 2.176.x

• CloudBees Jenkins Enterprise - Operations Center > 2.176.x

• CloudBees Jenkins Platform - Client Master > 2.176.x

• CloudBees Jenkins Platform - Operations Center > 2.176.x

• CloudBees Jenkins Distribution > 2.176.x

• CloudBees Jenkins X Distribution > 2.176.x

• Jenkins LTS > 2.176.x

• Using Firefox as a browser.

Resolution

This issue appeared in Jenkins 2.176.x and was fixed in 2.202 (weekly).
The fix was back-ported in the upcoming 2.190.3 LTS.

Workaround

In case you are running an impacted version, the only known workaround is to use another browser.

References