Firefox Slow Launch The launch speed depends on the installed add-ons, as well as the number of bookmarks and the volume of the magazine.
Disable or remove all those extensions that you doubt, and those that are too complicated, as they put a greater load on the browser. Disable and, if possible, remove plug-ins, except for those you need. Usually need only
Shockwave flash. If you have several versions of one plugin installed - leave only the latest one.
Bookmarks are affected if there are hundreds or thousands. Make a backup copy of all bookmarks in HTML format (Ctrl + Shift + H - import and backup), then delete all unnecessary. It is often easier to find information through
Yandexor
Google, than to search for one of hundred bookmarks.
Clear the log and set a limit on the maximum storage time for the history: open the page
about: configand set the value
browser.history_expire_days in days. It must not be less than the value of the parameter.
browser.history_expire_days_min (this value is set via the Firefox settings).
If the measures listed above did not help, install the program
Firefox preloader. It provides partial loading of Mozilla Firefox into RAM when the computer is turned on. This somewhat affects the speed of the computer as a whole, but reliably solves the problem of slow start.
Source: Pandonok with forum.mozilla-russia.org