我已经设置了应该运行Firefox的Jenkins作业。使用Jenkins用户登录到Ubuntu，我可以手动启动Firefox，而不会出现任何问题。但是，当我在詹金斯工作时，我得到：

[EnvInject] - Loading node environment variables.
Building in workspace /var/lib/jenkins/jobs/cbx4-ci/workspace
Fetching changes from the remote Git repository
Fetching upstream changes from git@bitbucket.org:cognibox/cbx4.git
Checking out Revision c90b791227b3788c2e023fd13db74ed1664428d1 (origin/master)
[EnvInject] - Executing scripts and injecting environment variables after the SCM step.
[EnvInject] - Injecting as environment variables the properties content 
PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin
FIREFOX_BIN=/usr/bin/firefox

[EnvInject] - Variables injected successfully.
[workspace] $ /bin/sh -xe /tmp/hudson985724635788604565.sh
+ bash -ex runkarma.sh
+ node_modules/karma/bin/karma start config/karma.conf.js --reporters junit
[32mINFO [karma]: [39mKarma v0.10.9 server started at http://localhost:9876/
[32mINFO [launcher]: [39mStarting browser Firefox
[31mERROR [launcher]: [39mCannot start Firefox

[32mINFO [launcher]: [39mTrying to start Firefox again.
[31mERROR [launcher]: [39mCannot start Firefox

[32mINFO [launcher]: [39mTrying to start Firefox again.
[31mERROR [launcher]: [39mCannot start Firefox

如您所见，我注入了环境变量以指向Firefox。

如果这可以帮助一些有用的版本号：

詹金斯1.546 NodeJs 0.10.24业力0.10.9

编辑：

可能很高兴知道我必须为jenkins用户执行一项操作才能首先运行firefox。作为我的主要用户，我必须通过这样做使其他用户启动firefox xhost +local:。否则，jenkins用户将不断收到以下错误。

No protocol specified
No protocol specified
No protocol specified
No protocol specified
Error: cannot open display: :0

尽管这可能是我解决的一个单独的问题，但可能对我要提出的问题有所帮助，因此我觉得增加这一细节很重要。