Change browser preferences in runtime?

Question

Can we change browser preferences in runtime?

Is there any possibility to changes the browser preferences set before launching the browser during execution programmatically?

Example:

I have set the following preferences before launching the driver

firefoxProfile.setPreference("pdfjs.disabled", true);
firefoxProfile.setPreference("plugin.scan.plid.all", false);
firefoxProfile.setPreference("plugin.scan.Acrobat", "99.0");

I want to change the preference to :

firefoxProfile.setPreference("pdfjs.disabled", **false**);
firefoxProfile.setPreference("plugin.scan.plid.all", **true**);
firefoxProfile.setPreference("plugin.scan.Acrobat", "99.0");

Please help!!

Thanks

Answer 1

It possible to change the settings at run-time using about:config UI. Below code demonstrates how to do the same

from selenium import webdriver

profile = webdriver.FirefoxProfile()
profile.set_preference("general.warnOnAboutConfig", False)

driver = webdriver.Firefox(firefox_profile=profile)

driver.get("about:config")

def set_bool_preferce(name, value):
    value = 'true' if value else 'false';

    driver.execute_script("""
        document.getElementById("textbox").value = arguments[0];
        FilterPrefs();
        view.selection.currentIndex = 0;

        if (view.rowCount == 1) {
           current_value = view.getCellText(0, {id:"valueCol"});
           if (current_value != arguments[1]) {
               ModifySelected();
           }
        } 
    """, name, value)


def set_string_preferce(name, value):

    modified = driver.execute_script("""
        document.getElementById("textbox").value = arguments[0];
        FilterPrefs();
        view.selection.currentIndex = 0;

        if (view.rowCount == 1) {
           current_value = view.getCellText(0, {id:"valueCol"});
           if (current_value != arguments[1]) {
               ModifySelected();
               return true;
           }
        } 

        return false;
    """, name, value)

    if modified is None or modified is True:
        alert = driver.switch_to.alert
        alert.send_keys(value)
        alert.accept()


set_bool_preferce("pdfjs.disabled", True)
set_string_preferce("plugin.disable_full_page_plugin_for_types", "application/pdf,application/pdf2")

driver.quit()