The browser is good, but Mozilla has been consistently losing market share despite being well-funded. There is considerable debate as to what specific mistakes were made, but the foundation spent a lot of money on side projects that did not benefit the browser such as Servo, Rust and FireFox OS. Likely market share could have been improved had this been spent on marketing or engineering work that directly benefited the browser.
The browser is good, but Mozilla has been consistently losing market share despite being well-funded. There is considerable debate as to what specific mistakes were made, but the foundation spent a lot of money on side projects that did not benefit the browser such as Servo, Rust and FireFox OS. Likely market share could have been improved had this been spent on marketing or engineering work that directly benefited the browser.
They spent a lot of money on their CEO and board, and funded it by getting rid of good programmers and defunding long term projects like Servo.