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✔ uBlocko 
is a general-purpose blocker. XUL
! uMatrix (ver. 1.1.4 XUL) filters net requests.
! NoScript (ver. 5.1.8.3 XUL) includes protection from cross-site scripting (XSS), Clickjacking and etc..
✔ CanvasBlocker blocks canvas-API to prevent canvas fingerprinting. WebExtension
✔ Cookies Exterminator erases cookies, localStorage and IndexedDB objects as soon as they become unused. XUL
! Decentraleyes (ver. 1.3.10) - local emulation of Content Delivery Networks (CDN). XUL
✔ Header Editor can modify request/response headers, redirect/cancel requests. WebExtension
✔ Neat URL cleans URLs removing 'Analytics' parameters. WebExtension
✔ No Resource URI Leak adds option to deny resource:// access to Web content. XUL
✔ Stop Fingerprinting disables/modifies some browser APIs that would otherwise allow browser fingerprinting. XUL
✔ WebAPI Manager controls page access to the Web API. WebExtension
✔ Load from Cache forces load resources from cache. XUL
✔ Force Images into Cache XUL
✔ ExportHTMLFolder exports Bookmarks folder in HTML. XUL
✔ Zoom Page is zoom manager. XUL
⛔ Go Parent Folder was removed from Mozilla Add-ons (AMO), but it can be found at Bugzilla. XUL
Marks:
✔ - latest version works,
! - older version works,
✘ - incompatible,
⛔ - removed from AMO,
XUL - extension written in XML User Interface Language developed by Mozilla,
WeExtension - extension is compatible with extension API supported by Google and W3C.
about:config lists most of preferences
about:cache - cache information
about:memory - memory information
about:networking - information about active connections
about:support includes very useful information about the browser in general, extensions, graphics, modified preferences
about:telemetry includes, for examples, the time start-up measurements
Firefox Archives - gHacks Tech News
Firefox Configuration Guide for Privacy Freaks and Performance Buffs | 12Bytes.org