Ghostery - http://www.ghostery.com HTTPS Everywhere - https://www.eff.org/https-everywhere Cloud To Butt Plus - https://addons.mozilla.org/en-US/firefox/addon/cloud-to-butt-plus/
Adblock Edge: Blocks all ads including "acceptable ads" https://addons.mozilla.org/en-US/firefox/addon/adblock-edge/
Better Privacy: Manage "super cookies" https://addons.mozilla.org/en-us/firefox/addon/betterprivacy...
Cookie Monster: Control who can set cookies. https://addons.mozilla.org/en-us/firefox/addon/cookie-monste...
NoScript: Blocks all scripts except for whitelisted domains https://addons.mozilla.org/en-us/firefox/addon/noscript/
RefControl: Modifies HTTP Referer on a per-site basis. https://addons.mozilla.org/en-us/firefox/addon/refcontrol/
RequestPolicy: Blocks all cross-site requests except whitelisted requests. https://requestpolicycontinued.github.io/
UAControl: Modifies User Agent on a per-site basis. https://addons.mozilla.org/en-us/firefox/addon/uacontrol/
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These are just to make my Internet experience more enjoyable/productive.
Classic Theme Restorer: Brings back navigation buttons, makes tabs square, and more. https://addons.mozilla.org/en-us/firefox/addon/classicthemer...
Firebug: Inspect and change HTML, CSS, and more. https://addons.mozilla.org/en-us/firefox/addon/firebug/
HN Utility Suite: collapse discussions. https://addons.mozilla.org/en-us/firefox/addon/hn-utility-su...
Image Block: If tethering on a limited connection. https://addons.mozilla.org/en-us/firefox/addon/image-block/
New Tab Tools: Makes new tab page nicer. https://addons.mozilla.org/en-us/firefox/addon/new-tab-tools...
Screengrab! (fix version): Take screenshot of whole webpage. https://addons.mozilla.org/en-us/firefox/addon/screengrab-fi...
Scrapbook has been a serious "problem" for me: I could never make the switch from firefox to chrome, even in the intermediate years when a majority of folks had ditched FF for Chrome; I needed my scrapbook.
Link with screenshots, manual: http://www.xuldev.org/scrapbook/
https://addons.mozilla.org/en-US/firefox/addon/read-it-later...
https://addons.mozilla.org/en-US/firefox/addon/google-no-tra...
https://addons.mozilla.org/en-US/firefox/addon/ghostery/
https://addons.mozilla.org/en-US/firefox/addon/make-address-...
https://addons.mozilla.org/en-US/firefox/addon/yesscript/
https://addons.mozilla.org/en-US/firefox/addon/copy-urls-exp...
https://addons.mozilla.org/en-US/firefox/addon/custom-button...
It allows you to select text that's part of a link by just clicking and dragging, just like all other text.
Other addons I use are: uBlock (https://github.com/gorhill/uBlock#firefox)
imagus (https://addons.mozilla.org/en-us/firefox/addon/imagus/)
self-destructing cookies (https://addons.mozilla.org/en-US/firefox/addon/self-destruct...)
clean links (https://addons.mozilla.org/en-us/firefox/addon/clean-links/)
https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...
pentadactyl http://5digits.org/nightlies
greasemonkey http://www.greasespot.net/
pentadactyl has a bit of learning curve to use it well. But after having using it for many years, it is the only addon that is keeping me away from chrome. No other vim style addon for chrome or firefox has come close, for me.
Firebug: https://addons.mozilla.org/en-US/firefox/addon/firebug/
Lastpass: https://addons.mozilla.org/en-us/firefox/addon/lastpass-pass...
Pushbullet: https://addons.mozilla.org/en-US/firefox/addon/pushbullet/
TooManyTabs: https://addons.mozilla.org/en-US/firefox/addon/toomanytabs-s...
Pocket: https://addons.mozilla.org/EN-us/firefox/addon/read-it-later...
uBlock: https://addons.mozilla.org/EN-us/firefox/addon/ublock/?src=s...
Cryptocat: https://addons.mozilla.org/EN-us/firefox/addon/cryptocat/
Blur(DoNotTrackMe): https://addons.mozilla.org/EN-us/firefox/addon/donottrackplu...
Disconnect: https://addons.mozilla.org/EN-us/firefox/addon/disconnect/
Flashgot: https://addons.mozilla.org/en-US/firefox/addon/flashgot
Tree Style Tab: https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...
Web of Trust: https://addons.mozilla.org/en-US/firefox/addon/wot-safe-brow...
HTTPS Everywhere: https://www.eff.org/files/https-everywhere-latest.xpi
Greasemonkey: https://addons.mozilla.org/EN-us/firefox/addon/greasemonkey/
Privacy Badger: https://addons.mozilla.org/en-US/firefox/addon/privacy-badge...