No you can let the browser run as much as you want without noticing any expense in system resources. In this way, they have addressed one of the oldest issues present in previous Firefox versions. Mozilla has also tweaked the Javascript module in order to free up memory no longer in use. This comes as a positive effect for the startup and page loading times, which suffered a lot in previous version. It is said that Firefox 7 has reduced its memory usage by 20% and even 50% in special cases. The most important improvement is the memory usage optimization. Similar to its previous version, Firefox 7 brings few notable improvements and features. While there are rumors regarding the idea of shortening this cycle to only five weeks, these won’t happen too soon. The seventh cycle of development confirms the rapid release schedule adopted by Mozilla this year. Six weeks after the release of Firefox 6, Mozilla officially released the new next version for Firefox.
