User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0 Build ID: 20180308100121 Steps to reproduce: By navigating to Options -> Privacy & Settings, it appears the ability to limit cache to any amount has been removed. Actual results: "Limit cache" has been removed from settings and the ability to just remove cache one time has been placed in the "Cookies and Site Data" section instead. During testing of websites, it was very useful to set the "Limit cache" ability to 0mb without needing to have the Developer Tools open all of the time with the "Disable cache" option checked. Expected results: My personal expected results were to see the ability to limit cache to a certain value. This may have been an intentional choice to deprecate this feature. However, if it was not, I wanted to report it as a possible feature that missed getting implemented in the new changes.

Confirmed. Disabling cache or changing it value is now harder per no GUI option in Preferences.

Yup, that was intentional and done in bug 1422160. Thank you for reporting your use case, but it enforces our opinion that this is mostly used for developer purposes (or for edge cases that warrant editing about:config).