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Documentation: Expand DevTools notes on creating a new Firefox profile

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Add a command to create a new Firefox profile, and add `--new-instance`
to the command line when using it.
This commit is contained in:
Timothy Flynn 2025-04-17 08:19:32 -04:00
parent 5e9a11b13d
commit c2f29287e7
1 changed files with 13 additions and 4 deletions
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17
Documentation/DevTools.md
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@ -456,23 +456,32 @@ WebContent process:
## Inspecting the protocol with Firefox
When developing a DevTools feature, it's invaluable to see how the DevTools protocol is used by Firefox itself. First,
enable remote debugging in your Firefox profile's `about:config` page. You may wish to create a new profile for this:
enable remote debugging in your Firefox profile's `about:config` page:
```
devtools.chrome.enabled = true
devtools.debugger.remote-enabled = true
```
Then close all Firefox windows. Restart Firefox via the command line, specifying the DevTools server port:
You may wish to create a new profile for this, rather than modifying your default profile. To create a new profile from
the command line:
```bash
firefox -CreateProfile YOUR_PROFILE_NAME
```
If you are using your default profile, then close all Firefox windows. Restart Firefox via the command line, specifying
the DevTools server port:
```bash
firefox --start-debugger-server 6000
```
If you created a new profile, specify its path with the `--profile` flag:
Or if you created a new profile, you do not need to close all Firefox windows. Instead, launch a new instance with the
`--new-instance` flag, and specify your new profile's path with the `--profile` flag:
```bash
firefox --start-debugger-server 6000 --profile ~/snap/firefox/common/.mozilla/firefox/z20dtqwq.TEST
firefox --start-debugger-server 6000 --new-instance --profile ~/snap/firefox/common/.mozilla/firefox/z20dtqwq.YOUR_PROFILE_NAME
```
After Firefox is running, we can now snoop the specified port. The Servo team has written a nice script using `tshark`