* add checkbox to each cookie in list for optional export filter
* add "Select All" global toggle

* add ability to export all cookies for all domains from the current privacy context
* add ability to import cookies for any domain to the current privacy context
* allow global export from tabs having no cookies
* display the "Show Advanced" global toggle in Firefox for Android

* add icon to each row in cookie list to copy value to clipboard
* update form to add new cookie with same fields that are available when editing
* improve logic to edit pre-existing cookie values
* add validation for updates to: "domain", "path", "secure"

Fix a minor bug that disabled the import button after encountering an error parsing JSON input.

Add ability to import cookies from a JSON file.

Firefox for Android can neither export-to nor import-from files. For this reason, the UI in Fenix doesn't display these options.

Firefox desktop can successfully export-to files. However, a configuration must be changed to import-from files: in "about:config", change "ui.popup.disable_autohide" to TRUE. After doing so, the "Esc" key is required to close the popup window. This prevents the popup from being closed when the file chooser dialog is opened.

* add ability to export cookies to clipboard in request header format
* fix ability to export cookies to clipboard from devtools

Firefox for Android:

* fix CSS to hide filtered cookies
* export Netscape format to clipboard

* fix devtools tab
* update the API used to copy text to the clipboard