It would definitely hurt not to have these on hand:
- DownThemAll - for yet another really slow and uncooperative SharePoint installation
- Open in IE - for the same reason as DownThemAll -- the site sometimes works better with IE
- HTTPS Everywhere - have this on all my machines for overall better security and privacy
- Print Edit - I print a lot and this saves me a *lot* of ink. The PDF save tool inside it is also excellent.
- TileTabs - lots of our tools are web based so being able to fit more on one screen makes me more productive
- uBlock Origin - I don't really have strong feelings about adblocking tools, I just need to keep distractions to a minimum.
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