Although Firefox accepts all cookies by default, the browser actually offers more options than Chrome when it comes to customizing these settings.
Access custom settings: Click on the “Tools” menu button at the top, and in the drop-down menu, select “Options.” Navigate to the “Privacy” tab and under “History” set Firefox to “Use custom settings for history.”
Manage cookies: Firefox gives you a number of options when it comes to managing your cookies: you can accept or block cookies outright, block third-party cookies, block specific third-party cookies that do not come from any site you visit, or prompt Firefox to ask for your permission every time it wants to store a cookie (running Firefox under this setting exposes just how ubiquitous cookie usage has become).
Delete cookies: Click on“Show Cookies…” which appears once you’ve enabled custom settings for your browser history. From there, you can scroll through a list of cookies accumulated by Firefox, clear them individually or remove them all as a group.
Firefox (iOS): Tap the New Tab button (top right, with the number in it). Now tap the cog button in the top left of the screen. Scroll down to “Clear private data.” On the next screen, make sure “Cookies” is selected, then tap “Clear Private Data”.