Windows10下Python+Selenium+Firefox报错：无法匹配功能集

Hey there, let's work through this "Unable to find a matching set of capabilities" error you're hitting. This is almost always a version compatibility or configuration issue with your Firefox, GeckoDriver, and Selenium setup. Here's how to troubleshoot it step by step:

1. Double-check GeckoDriver Path Configuration #

First, make sure your system can find the GeckoDriver executable. Either:

• Add the folder containing geckodriver.exe to your Windows PATH environment variable, or
• Explicitly specify the path in your code like this:

from selenium import webdriver

# Replace the paths with your actual file locations
browser = webdriver.Firefox(executable_path=r'C:\Users\YourName\Downloads\geckodriver.exe')
browser.get('http://seleniumhq.org/')

If Firefox isn't installed in the default location, you'll also need to specify its binary path:

from selenium import webdriver
from selenium.webdriver.firefox.options import Options

options = Options()
options.binary_location = r'C:\Program Files\Mozilla Firefox\firefox.exe'
browser = webdriver.Firefox(executable_path=r'C:\path\to\geckodriver.exe', options=options)
browser.get('http://seleniumhq.org/')

2. Verify Version Compatibility #

While GeckoDriver 0.20.0 is technically supposed to support Firefox 55-59, older Selenium versions sometimes have quirks with these combinations. Try upgrading your Selenium to a more stable older version that pairs well with this stack:

pip install selenium==3.141.0

Also, double-check that Firefox hasn't auto-updated to a newer version (this happens sometimes without notice!). Open Firefox, go to Help > About Firefox to confirm it's still on v59.

3. Rule Out Windows 10 Permission Issues #

Windows 10's UAC (User Account Control) can sometimes block GeckoDriver from launching Firefox. Try right-clicking your Python script file and selecting Run as administrator to see if the error goes away.

4. Manually Specify Desired Capabilities #

If the above steps don't work, explicitly set the capabilities to match your Firefox version:

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

caps = DesiredCapabilities.FIREFOX.copy()
caps["marionette"] = True  # Required for Firefox 59+ with GeckoDriver
caps["acceptInsecureCerts"] = True

browser = webdriver.Firefox(capabilities=caps)
browser.get('http://seleniumhq.org/')

Give these steps a try—one of them should get your Selenium script up and running with Firefox 59.

内容的提问来源于stack exchange，提问作者Michael Innes