[Feature request] Ability to set instance prefs and localState in addition to args

I want to provide Chrome instance with prefs/localState. Using ChromeDriver’s chromeOptions (https://sites.google.com/a/chromium.org/chromedriver/capabilities) I could set something like this:

prefs: {
    download: {
        prompt_for_download: false,
        default_directory: DOWNLOAD_PATH,
    }
},
localState: {
    browser: {
        "enabled_labs_experiments": [
            // All preferences can be found here: https://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/pref_names.cc?view=markup
            "enable-native-notifications@2",
        ],
    }
},

Is it possible to do the same with puppeteer? (I saw the workaround for setting download dir through _client, but the question is more general)

Here is related issue: https://github.com/GoogleChrome/puppeteer/issues/1577

[skyiea]

@berstend As far as I recall I managed to shift localState by modifying /Profile X/Local State file (there was some cryptic notation, which I understood by analyzing existing props in localState file). I guess you are right, about the deprecation. In the recent Chrome version I can’t find the file anymore.

PS: thanks for popping out extras, looks promising! I guess it resolves this feature request, and we can close it now.

[skyiea]

@aslushnikov Yeah, will look into this next week.