In the last couple of days I noticed that if I open Firefox on my Android phone and let's say open up a couple of new tabs, leave them there and close the app the next time I open up the app randomly some of the newly opened tabs disappear (they are there in the history as visited but the tab isn't open). Also in if I let's say use a tab that already have been open and use it to browse some website when I reopen the app the webpage loaded sometimes doesn't load the last visited site but one that was visited before that one (but still the actual site is in the history). For example let's say I open a tab and I go to site 1, then site 2, then site 3, close and reopen the app the tab I last used could randomly either be missing, instead of site 3 actually load site 1/2 or with equal chance actual work and load site 3 where I left off.