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Reset Browser: The command restarts the browser process. This will clear cookies, user agents and any other settings in the browser. Clear All Cookies: This command will only delete all cookies, nothing more, nothing less. So, if you want to be sure to have a complete new session, I would recommend using the "reset browser" command. If you only want to clear cookies, use "clear all cookies" instead. Hope it helps.

I think using "reset browser" is good, as it ensures the complete browser process gets terminated and started again thereafter. Also you can try utilizing additional plugins that allow to free up memory. And you may consider building your programs in such a way that after each task done the results are getting saved. So that if you need to restart the program, it knows where to go on. This is especially advisable if you try to automate a whole lot of tasks and want to prevent unforeseen events.

I know this thread is old but since it's been bumped already: The freezing is a common browser problem, just use the close page command every so many loops (try 10-30) and it will usually fix this.