Firefox
Firefox is a free, open-source web browser developed and maintained by the Mozilla Foundation, first released in 2004. Firefox is characterized by its emphasis on user privacy protection, high extensibility, and cross-platform support, backed by a rich ecosystem of plugins and extensions. It uses the Gecko layout engine to render web pages and adheres to open web standards, making it one of the leading desktop and mobile browsers worldwide.
Core Facts
Playwright natively supports three browser engines: Chromium, Firefox, and WebKit (Safari engine).
The Readability algorithm was originally developed by Mozilla for Firefox's reader mode.
Firefox's Gecko rendering engine and SpiderMonkey JavaScript engine are both written extensively in C++.
Timeline (last 90 days)
Browser support for `:focus-visible` is already quite mature, available in Chrome, Firefox, Safari, and mainstream mobile platforms; however, older browser versions will ignore this rule, so keeping a `:focus` fallback style is more reliable.
Enterprises often choose Chrome or Edge because of deep ties to Google Workspace or Microsoft 365, and switching to Firefox means a large number of surrounding elements need to be re-adapted.
Firefox's global browser share has continued to come under pressure in recent years.
Firefox is the only mainstream browser with an independent engine.
The ESR version undergoes a major version upgrade only about once a year, during which only security patches and critical fixes are pushed, while the regular version updates about every four weeks.
WASM's SIMD128 extension is supported by Chrome 91+, Firefox 89+, and Safari 16.4+.
Firefox is implementing resumable downloads (resumable download capability) for large files.
If Firefox makes its probing and resumption strategy more robust, it could become a differentiating advantage relative to Chrome.
Firefox on PS2 Linux can start and render pages but performs poorly, and a large number of modern websites cannot be accessed because the certificate system from 25 years ago is completely incompatible with current SSL standards.
Browsers such as Chrome and Firefox have begun deploying hybrid key exchange.
40 more timeline events
All Facts (20)
Playwright natively supports three browser engines: Chromium, Firefox, and WebKit (Safari engine).
80%VerifiedThe Readability algorithm was originally developed by Mozilla for Firefox's reader mode.
70%VerifiedFirefox's Gecko rendering engine and SpiderMonkey JavaScript engine are both written extensively in C++.
65%UnverifiedServo的部分技术成果（如CSS并行解析器）已被Firefox采用
85%UnverifiedZotero 7基于Firefox的Gecko引擎重构，插件开发框架从XUL迁移到了基于Web技术的新架构
85%UnverifiedFirefox在2021年移除了桌面端的PWA安装支持，仅保留移动端
85%UnverifiedW3C CSS Backgrounds Level 4规范已将background-clip: text标准化，Firefox 122+和现代Chrome均已支持无前缀版本
80%UnverifiedFirefox代码库包含超过2000万行C/C++代码
80%UnverifiedFirefox拥有数千万行代码
80%Unverified传统静态分析工具如Coverity和CodeQL在处理Firefox级别的代码库时面临路径爆炸问题，导致超时或大量误报
75%UnverifiedFirefox的代码库超过2000万行
75%UnverifiedTampermonkey supports mainstream browsers including Chrome, Edge, and Firefox, and has more than 10 million active users.
60%UnverifiedModern browser extensions primarily follow the WebExtensions API standard, which was led by Mozilla, and has been adopted by mainstream browsers including Chrome, Firefox, and Edge.
60%UnverifiedBrowser support for `:focus-visible` is already quite mature, available in Chrome, Firefox, Safari, and mainstream mobile platforms; however, older browser versions will ignore this rule, so keeping a `:focus` fallback style is more reliable.
50%UnverifiedThe ESR version undergoes a major version upgrade only about once a year, during which only security patches and critical fixes are pushed, while the regular version updates about every four weeks.
50%UnverifiedFirefox is the only mainstream browser with an independent engine.
50%UnverifiedFirefox's global browser share has continued to come under pressure in recent years.
50%UnverifiedEnterprises often choose Chrome or Edge because of deep ties to Google Workspace or Microsoft 365, and switching to Firefox means a large number of surrounding elements need to be re-adapted.
50%UnverifiedWASM's SIMD128 extension is supported by Chrome 91+, Firefox 89+, and Safari 16.4+.
50%UnverifiedFirefox is implementing resumable downloads (resumable download capability) for large files.
50%