Title: Firefox Quantum Last modified: November 20, 2017 --- # Firefox Quantum * Resolved [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/) * Hey Frank, * GeneratePress has a mobile.css file which has a media query within it. * When using Autoptimize with Firefox Quantum on mobile, it’s like the media query is being completely ignored. You can see this on the demo site I linked to. Check the main menu vs. using Chrome. * When I disable Autoptimize, the issue goes away. * Any ideas what’s going on? Something that needs to be tweaked in the theme possibly? * Here’s a link to the original topic where it was reported to me: [https://generatepress.com/forums/topic/problems-with-mobile-view-ind-firefox-quantum/#post-428356](https://generatepress.com/forums/topic/problems-with-mobile-view-ind-firefox-quantum/#post-428356) * Thanks, and keep up the great work! 🙂 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffirefox-quantum%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 12 replies - 1 through 12 (of 12 total) * Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * (@optimizingmatters) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9700522) * well, to make things even more interesting; I just download FF Quantum (on Ubuntu and had not received update yet) and your demo-site looks perfect on desktop and mobile view, cfr. [https://imgur.com/a/K6vQ2](https://imgur.com/a/K6vQ2) * I’ll see if I can get hold of a Windows machine later today 🙂 * Thread Starter [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9700543) * I can only get it to happen when on my actual phone for what it’s worth – spent about 20 minutes trying to get it to happen on my Windows machine with no luck. * Perhaps Quantum is taking some shortcuts to increase speed on mobile.. I have no idea. Never seen anything like it. * Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * (@optimizingmatters) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9700699) * > I can only get it to happen when on my actual phone for what it’s worth – spent > about 20 minutes trying to get it to happen on my Windows machine with no luck. * Confirmed; I can reproduce this behavior on the demo-site on my smartphone (which had Quantum already). So the scope: GeneratePress + Autoptimize + Firefox Quantum Mobile … This is going to be fun 😉 * Can we experiment with the demo-site, or can you set up another instance where we can fiddle with settings & plugins & code snippets (to hook into AO’s API) to try to pinpoint the exact root cause? * Thread Starter [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9702661) * Absolutely – I’ll get one set up today 🙂 * Thread Starter [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9704715) * I set it up on a test server, but couldn’t reproduce the issue. However, like the original reporter, the issue goes away when I disable CSS optimization on the demo site. I’ll dig a little deeper and get back to you. * Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * (@optimizingmatters) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9704727) * So it’s not generatepress core, but triggered by (one of) the premium add-ons or one of the non-GP plugins? * Thread Starter [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9704738) * Couldn’t get it to happen with all of the add-ons activated either. There’s also nothing within the add-ons I can think of that would alter how files are enqueued. * I’ll duplicate the demo site and will pick it apart bit by bit – I’ll get back to you once I have a clearer picture of what’s going on – don’t want to waste your time. * Thanks for being so responsive 🙂 * Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * (@optimizingmatters) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9704792) * > Thanks for being so responsive 🙂 * right back at ya! * Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * (@optimizingmatters) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9730115) * no news yet [@edge22](https://wordpress.org/support/users/edge22/) ? * Thread Starter [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9731960) * None yet – been busy with getting GP 2.0 ready for release (no more jQuery!). * You can find the latest here: [https://generatepress.com/forums/topic/problems-with-mobile-view-ind-firefox-quantum/#post-431167](https://generatepress.com/forums/topic/problems-with-mobile-view-ind-firefox-quantum/#post-431167) * Hoping to take a closer look at their staging site as soon as it’s up. * Thread Starter [Tom](https://wordpress.org/support/users/edge22/) * (@edge22) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9767990) * Looks like GP 2.0 fixed it (not sure how!?): [https://generatepress.com/forums/topic/problems-with-mobile-view-ind-firefox-quantum/page/2/#post-445979](https://generatepress.com/forums/topic/problems-with-mobile-view-ind-firefox-quantum/page/2/#post-445979) * Glad you didn’t waste too much time on it. * Keep up the great work – I’m a fan 🙂 * Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * (@optimizingmatters) * [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9768042) * That’s great Tom, thanks for the feedback and the compliment 🙂 * enjoy your Sunday! frank Viewing 12 replies - 1 through 12 (of 12 total) The topic ‘Firefox Quantum’ is closed to new replies. * ![](https://ps.w.org/autoptimize/assets/icon-256X256.png?rev=2211608) * [Autoptimize](https://wordpress.org/plugins/autoptimize/) * [Frequently Asked Questions](https://wordpress.org/plugins/autoptimize/#faq) * [Support Threads](https://wordpress.org/support/plugin/autoptimize/) * [Active Topics](https://wordpress.org/support/plugin/autoptimize/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/autoptimize/unresolved/) * [Reviews](https://wordpress.org/support/plugin/autoptimize/reviews/) * 12 replies * 2 participants * Last reply from: [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/) * Last activity: [8 years, 6 months ago](https://wordpress.org/support/topic/firefox-quantum/#post-9768042) * Status: resolved