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SpecsUpdate
Pros
Pro High performance
The Firefox Quantum update (FF57) greatly increases the render speed and general performance of the browser, by taking better advantage of the user's hardware.
Pro Ethical and pragmatic company mission
The Mozilla Manifesto outlines the company's mission and principles. Paraphrasing, they want the Internet to be a free and open resource, and to enable individuals to get the best use of that resource. They do this by creating open source software to which anyone may contribute, so long as such contributions fit with their principles (both ethical and technical).
Pro Reader View
Reader View in Firefox allows users to read an article without any distractions by removing ads, unrelated elements and other distractive objects (similar to Microsoft Edge's Reading Mode and Safari's reader mode).
Pro Fast bookmark management
In order to add an open page to the bookmark bar, the tab can be dragged down and is added immediately.
Pro Lower memory fingerprint than competitors
Firefox used to be a trailer in memory usage, but as of 2017 it's less hungry for memory than competitors like Edge, Chrome, Safari and Opera.
Pro Easy screenshots without extensions
Within the browser itself, you can easily take screenshots and save them to your computer.
Pro Uses less resources
Firefox 57 (Quantum) and newer uses less resources than ever. It is proven with benchmark done by AppleInsider.
Pro Text-to-speech (with adjustable speed) without add-ons
Firefox Reader Mode includes Narrate, a feature that adds text-to-speech functionality to the browser.
Pro Tagging bookmarks
Firefox is one of the few browsers that you can tag your bookmarks. You can view a list of tags and can search your bookmarks in the address bar with tags.
Pro Good font rasterizing
Font rasterizing on Windows is much better than in competitors. Even smaller text is clear and contrast.
Pro Automatically updated
Firefox is automatically updated on the platforms where it makes sense.
Pro Strong developer tool
The built-in developer tools have been merged with the popular FireBug extension since FF57
Pro Syncs between devices
Firefox Sync is an optional feature in Firefox that allows syncing bookmarks, passwords, and add-ons between devices.
Cons
Con Some built-in advertising
With their new "pocket" feature, they offer advertisements built-in.
Con Installs Addons with updates
Mozilla is installing/integrating addons with every update like the Mr. Robot promotion - it also has integrated Pocket that spams you every time you open the browser or a new tab with partners of Pocket.
Con Restoring previous session restores previous window sizes
When Firefox restores previous session, it restores the sizes of windows in the previous session which do not fit the current window sizes allocated by tiling window managers. Thus, I have to resize the Firefox windows by changing tiling layout. See here.
Con Tiled Firefox pop-up windows have huge black margins
Tiled Firefox pop-up windows have huge black margins in tiling window managers. But, chromium-based browsers don't.
Con Uses GTK on Linux/BSD
This makes the integration on non-GTK Desktop Environments very hard.
Recommendations
Comments
Flagged Pros + Cons
Pro Restoring previous session restores previous window sizes.
When firefox restores previous session, it restores the sizes of windows in the previous session which do not fit the current window sizes allocated by tiling window managers. Thus, I have to resize the firefox windows by changing tiling layout. https://bugzilla.mozilla.org/show_bug.cgi?id=686747
You can work around the issues by using third-party session managers to restore previous sessions and by turning all pop-up windows into new tabs.
