There is a way to set up Eclipse to do this.
In Eclipse (AKA Flash Builder)
1) Select the Run External Tools
icon (green arrow with small red toolbox) OR Run
menu -> External Tools
.
2) Select External Tools Configuration
.
3) Under the Location
heading select the Browse File System
button and browse to the executable for the Browser that you want to use.
4) Under the Arguments:
header add this http://localhost:8080/${project_name}/index.html
exactly. The variable will allow you keep the configuration generic and work for any project.
5) I suggest you give it name like "Chrome - current project index.html"
6) Repeat this process for all the browsers that you wish to test with.
To use this, just select the configuration you created from the Run External Tools
. (please note that you will need to Run
it from the Configuration the first time for it to show up in the drop-down)
NOTE: I have confirmed this is available in the Flash perspective of Flash Builder.
There is a move complete description of this process with pics at
AVAJAVA Web Tutorials.
Alternatively you could use Selenium WebDriver, to open up multiple browsers. Using Selenium also has the added benefit of allowing you to set up unit testing (I use the term loosely here) of the UI. (Though I am not sure that last part would work with Flash/Flex)
Here are several links that describe this very situation.
Abode QA blog
running selenium webdriver test cases against multiple browsers
Running JUnit Tests On different browsers using Selenium "Automatically"