No prob. Also, if you're tempted to go to chrome to access the blocked sites (I know I am), use Stay Focused. 

thanks covers pretty much I was looking for

[Leechblock](https://addons.mozilla.org/en-US/firefox/addon/leechblock/) blocks sites based on times and days. You can have up to 5 sets of blocking times, days, and sites that it blocks. Check to see if it works with your version of FF. 



I used to use [this addon](https://addons.mozilla.org/en-US/firefox/addon/blocksite/), but then it was bought (or made) by the snooping company WIPS. As usual Mozilla has not bothered to take down the addon. There are still top ranking how to articles on the [Internet recommending it](http://www.wikihow.com/Block-Websites-on-Firefox).

Are there other similar addons that let you add URLs to block? I used this to get work done by blocking sites like reddit. Then turning it off when I am not working.

Block Site Addon recommendations