Hello, If the phone is not used for a while, it takes a very long time to open a page in Firefox. The bar immediately goes to about 25% and hangs. When it finally starts, it works. Sometimes it hangs during use, but usually the problem occurs after a long period of inactivity. What I do know: * The problem does not occur with any other browser or application. * The problem occurs on different smartphones from different manufacturers running different versions of Android. * Deleting and reinstalling Firefox cleanly (without any add-ons) does not help. * Same problem over Wi-Fi as over cellular. * Turning Firefox off and on again usually does not help. I installed Waterfox and for a while there was no problem at all. Then it appeared. I noticed that at least in Waterfox, the problem does not occur in private mode. This is an unresolved issue that has been discussed before. https://support.mozilla.org/questions/1416241