Running the latest Firefox for testing

Not sure what "from tc import *" does, but to launch Firefox browser, it's

# Open smartbear.com in Firefox browser:
Browsers.Item[btFirefox].Run("http://smartbear.com");

And take note of Web Testing with Firefox and Supported Browsers

Mozilla Firefox 91 - 115.10 ESR, 94 - 140 (both 32- and 64-bit versions)

Note: Beta versions of Mozilla Firefox may not work with TestComplete. They are not supported and we recommend using a stable release.

Add tcFirefoxRunner.exe (from TestComplete Bin folder) to your Tested Apps list, and launch it from Tested Apps.

You’re absolutely right: to automate modern Firefox versions (e.g. 145) in TestComplete 15.79+, you need to use Puppeteer-based automation via tcFirefoxRunner.exe. Simply calling Browsers.Item[btFirefox].Run(...) will use the legacy Firefox executable, which is not compatible.

Correct way in Python:

import Browsers

def test():
    Browsers.Item["Firefox"].Run("http://smartbear.com/products")

Under the hood, TestComplete will launch tcFirefoxRunner.exe in RemoteAgent mode, which is required for Puppeteer support. (SmartBear Support)

For more details, refer to the TestComplete docs: Web Testing with Firefox — Running Firefox with tcFirefoxRunner.exe. 

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After reviewing the SmartBear documentation, I realized my first response was inaccurate/incomplete, so I wanted to clarify. I have not tested this myself, but according to official docs, the correct way to launch Firefox in TestComplete 15.79+ is:

import Browsers

def test():
    Browsers.Item[btFirefox].Run("https://smartbear.com/products")

Firefox 145: This version is beyond the documented supported range (91–115.10 ESR, 94–140), so TestComplete may fall back to the legacy executable. (Supported Browsers)
Also you can check if the correct runner is used by looking for tcFirefoxRunner.exe in Task Manager before and while the test is running, or by reviewing the TestComplete log for browser initialization messages. 

Manual launch of tcFirefoxRunner: Only needed for recording tests, not for running automated scripts. TestComplete handles it internally for supported versions. (Preparing Firefox for testing)

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