- #Why did firefox 45.0.2 disable javascript mac os x
- #Why did firefox 45.0.2 disable javascript plus
- #Why did firefox 45.0.2 disable javascript windows
Private Browsing with Tracking Protection blocks certain Web elements that could be used to record your behavior across sitesĬontrol Center that contains site security and privacy controls Picture element does not react to resize/viewport changes Screenshot a node or element from markup view with the Screenshot Node context menu itemĬopy element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector Quickly add new CSS rule with New Rule button in the Inspector Network requests can be exported in HAR format Removed support for binary XPCOM components in extensions, use addon SDK "system/child_process" pipe mechanism for native binaries instead Implemented Cache API for querying named caches that are accessible Window, Worker, and ServiceWorker
#Why did firefox 45.0.2 disable javascript mac os x
Navigator.onLine now varies with actual internet connectivity (Windows and Mac OS X only)Ĭopy/Cut Web content from JavaScript to the OS clipboard with document.execCommand("cut"/"copy") MessageChannel and MessagePort API enabled by defaultĪdded support for the transform-origin property on SVG elements Support for running animations of 'transform' and 'opacity' on the compositor thread WebRTC now requires perfect forward secrecy Improved box-shadow rendering performance
#Why did firefox 45.0.2 disable javascript windows
We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!Įnhance IME support on Windows (Vista +) using TSF (Text Services Framework)Ībility to set a profile picture for your Firefox Accountįirefox Hello now includes instant messaging If interested, please see the complete list of changes in this release. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. It captures only the whole word \w+, not a part of it.įor instance, in the word JavaScript it may not only match Java, but leave out Script to match the rest of the pattern.Version 41.0, first offered to Release channel users on September 22, 2015Ĭheck out "What’s New" and "Known Issues" for this version of Firefox below.
#Why did firefox 45.0.2 disable javascript plus
So we essentially implemented a possessive plus + quantifier. Why? That’s because the lookahead finds a word \w+ as a whole and we capture it into the pattern with \1. That is: we look ahead – and if there’s a word \w+, then match it as \1. …And allow us to reference it in the pattern as \1.Then the engine will memorize their contents isn’t memorized by the engine, so wrap \w+ into parentheses. Lookahead ?= looks forward for the longest word \w+ starting at the current position.That may seem odd, but it’s actually a very simple transform. Of course, we could take another pattern instead of \w. The pattern to take as many repetitions of \w as possible without backtracking is: (?=(\w+))\1. We’d like a quantifier, such as + not to backtrack, because sometimes backtracking makes no sense. We can emulate them though using a “lookahead transform”. …But the bad news is that, unfortunately, in JavaScript they are not supported. There are also so-called “atomic capturing groups” – a way to disable backtracking inside parentheses. The search process without backtracking is simpler. They just match as many as they can, without any backtracking. Possessive quantifiers are in fact simpler than “regular” ones. That is, we use \d++ instead of \d+ to stop + from backtracking. Regular quantifiers become possessive if we add + after them. Modern regular expression engines support possessive quantifiers for that. There’s no need to lower the repetitions count in \w+ or to split it into two words \w+\w+ and so on. That is: \w+ should match a whole word, with the maximal possible length. This regexp is equivalent to the previous one (matches the same) and works well:Īnd in the original example ^(\w+\s?)*$ we may want to forbid backtracking in \w+. Let’s make the space non-optional by rewriting the regular expression as ^(\w+\s)*\w*$ – we’ll look for any number of words followed by a space (\w+\s)*, and then (optionally) a final word \w*. The first is to lower the number of possible combinations. There are two main approaches to fixing the problem. Some regular expression engines have tricky tests and finite automations that allow to avoid going through all combinations or make it much faster, but most engines don’t, and it doesn’t always help. The order of combinations will change, but not their total count. Unfortunately, that won’t help: if we replace \w+ with \w+?, the regexp will still hang. As there are many such combinations (we’ve seen it with digits), the search takes a lot of time. It tries all combinations of how the regexp (\w+\s?)* can “consume” the string, including variants with spaces (\w+\s)* and without them (\w+)* (because spaces \s? are optional). For a human, it’s obvious that there may be no match, because the string ends with an exclamation sign !, but the regular expression expects a wordly character \w or a space \s at the end.