[ESR91][feature request] Make website navigation more responsive.

[dgeelen]

From the thread here, please change these defaults as follows:

• apz.content_response_timeout: 600 → 150
• ui.click_hold_context_menus.delay: 800 → 200

This corresponds to dividing these values by four. As reported in the thread, this makes the browsing experience much more pleasant and responsive.

[rainemak]

This ui.click_hold_context_menus.delay: 800 → 200 sounds too quick. This will start triggering accidental context menus.

Further, we are using platform side context menu delay. We could consider reducing few hundreds of milliseconds from platfrom default. Firefox defaults to 500.

Content_response_timeout matches to Android FF. I'd rather stick with that.