The following table provides summary statistics for permanent job vacancies advertised in London with a requirement for Firebug skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited Firebug over the 3 months to 28 April 2017 with a comparison to the same period in the previous 2 years.

Firebug
England / London
3 months to
28 Apr 2017
Same period 2016 Same period 2015
Rank 602 649 651
Rank change year-on-year +47 +2  
Permanent jobs citing Firebug 2 18 29
As % of all permanent IT jobs advertised in London 0.006% 0.042% 0.065%
As % of the Development Applications category 0.028% 0.22% 0.40%
Number of salaries quoted 2 17 21
Median salary £70,000 £45,000 £45,000
Median salary % change year-on-year +55.55% -  
UK excluding London median salary £29,500 £25,000 £38,500
% change year-on-year +18.00% -35.06%  

Firebug is in the development application skills category. The next table is for comparison with the above and provides summary statistics for all permanent job vacancies advertised in London with a requirement for development application skills.

Development Application Skills
London
Permanent job vacancies with a requirement for development application skills 7089 8166 7223
As % of all permanent IT job vacancies advertised in London 20.44% 19.28% 16.15%
Number of salaries quoted 5932 7114 6024
Median salary £60,000 £56,000 £53,000
Median salary % change year-on-year +7.14% +5.66%  
90% offered a salary of more than £40,000 £40,000 £40,000
10% offered a salary of more than £80,000 £70,000 £77,500
UK excluding London median salary £42,500 £42,500 £42,250
% change year-on-year - +0.59%  

Firebug
Job Vacancy Trend in London

The job posting trend of jobs advertised in London citing Firebug as a proportion of all permanent or contract IT jobs with a match in the Development Applications category.

Job vacancy trend for Firebug in London

Firebug
Salary Trend in London

This chart provides the 3-month moving average for salaries quoted in permanent IT jobs citing Firebug in London.

Salary trend for Firebug in London

For the 6 months to 28 April 2017, IT jobs citing Firebug also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all job ads across the London region with a requirement for Firebug.

1 12 (100.00%) JavaScript
1 12 (100.00%) HTML
1 12 (100.00%) CSS
2 8 (66.67%) C#
2 8 (66.67%) Perl
2 8 (66.67%) Python
2 8 (66.67%) Degree
2 8 (66.67%) JSON
2 8 (66.67%) JIRA
2 8 (66.67%) Computer Science
3 7 (58.33%) Web Development
3 7 (58.33%) PHP
3 7 (58.33%) RESTful
4 6 (50.00%) Android
4 6 (50.00%) SaaS
4 6 (50.00%) HTML5
4 6 (50.00%) Apple iOS
4 6 (50.00%) Digital Media
4 6 (50.00%) CSS3
4 6 (50.00%) Cross-Browser Compatibility
4 6 (50.00%) Apple
4 6 (50.00%) B2B
4 6 (50.00%) Ruby
4 6 (50.00%) CMS
5 4 (33.33%) Agile Software Development
5 4 (33.33%) MVC
5 4 (33.33%) Fiddler
5 4 (33.33%) jQuery
6 3 (25.00%) Git (software)
6 3 (25.00%) AngularJS

Firebug
Co-occurring IT Skills in London by Category

The follow tables expand on the table above by listing co-occurrences grouped by category. The same job type, locality and period is covered with up to 20 co-occurrences shown in each of the following categories:

Application Platforms
1 6 (50.00%) CMS
2 2 (16.67%) Confluence
3 1 (8.33%) IIS
3 1 (8.33%) JBoss
3 1 (8.33%) nginx
3 1 (8.33%) Tomcat
Cloud Services
1 6 (50.00%) SaaS
2 1 (8.33%) Amazon AWS
2 1 (8.33%) Google Analytics
2 1 (8.33%) Microsoft Azure
Communications & Networking
1 2 (16.67%) BGP
1 2 (16.67%) DNS
1 2 (16.67%) HTTP
1 2 (16.67%) Internet
1 2 (16.67%) SSL
1 2 (16.67%) Wireshark
Database & Business Intelligence
1 2 (16.67%) SQL Server
2 1 (8.33%) DB2
Development Applications
1 8 (66.67%) JIRA
2 4 (33.33%) Fiddler
3 3 (25.00%) Git (software)
4 2 (16.67%) Grunt
4 2 (16.67%) gulp
4 2 (16.67%) Subversion
4 2 (16.67%) Visual Studio
5 1 (8.33%) Bower
5 1 (8.33%) Bundler
5 1 (8.33%) Gerrit
5 1 (8.33%) Jenkins
5 1 (8.33%) PostCSS
General
1 3 (25.00%) Finance
2 1 (8.33%) Manufacturing
2 1 (8.33%) Marketing
2 1 (8.33%) Retail
2 1 (8.33%) Telecoms
Job Titles
1 6 (50.00%) JavaScript Engineer
1 6 (50.00%) Support Engineer
1 6 (50.00%) Technical Engineer
1 6 (50.00%) Technical Support
1 6 (50.00%) Technical Support Engineer
1 6 (50.00%) Web Engineer
1 6 (50.00%) Web Support Engineer
2 3 (25.00%) Developer
3 2 (16.67%) .NET Developer
3 2 (16.67%) .NET Team Leader
3 2 (16.67%) Analyst
3 2 (16.67%) Lead .NET Developer
3 2 (16.67%) Lead Developer
3 2 (16.67%) Performance Analyst
3 2 (16.67%) Senior .NET Developer
3 2 (16.67%) Senior Developer
3 2 (16.67%) Team Leader
4 1 (8.33%) Performance Engineer
4 1 (8.33%) Service Performance Analyst
4 1 (8.33%) UI Developer
Libraries, Frameworks & Software Standards
1 12 (100.00%) CSS
1 12 (100.00%) HTML
2 8 (66.67%) JSON
3 7 (58.33%) RESTful
4 6 (50.00%) CSS3
4 6 (50.00%) HTML5
5 4 (33.33%) jQuery
6 3 (25.00%) .NET
6 3 (25.00%) Ajax
6 3 (25.00%) AngularJS
6 3 (25.00%) JSP
6 3 (25.00%) Twitter Bootstrap
7 2 (16.67%) .NET Framework
7 2 (16.67%) ASP.NET Web API
7 2 (16.67%) Entity Framework
7 2 (16.67%) KnockoutJS
7 2 (16.67%) Node.js
7 2 (16.67%) Web Services
8 1 (8.33%) Mustache
8 1 (8.33%) Smarty
Miscellaneous
1 8 (66.67%) Computer Science
2 6 (50.00%) Digital Media
3 1 (8.33%) Algorithms
3 1 (8.33%) Data Structures
3 1 (8.33%) DataPower
3 1 (8.33%) Life Science
3 1 (8.33%) Mainframe
3 1 (8.33%) User Experience
Operating Systems
1 6 (50.00%) Android
1 6 (50.00%) Apple iOS
Processes & Methodologies
1 7 (58.33%) Web Development
2 6 (50.00%) B2B
2 6 (50.00%) Cross-Browser Compatibility
3 4 (33.33%) Agile Software Development
3 4 (33.33%) MVC
4 3 (25.00%) OO
5 2 (16.67%) Data Analysis
5 2 (16.67%) Financial Modelling
5 2 (16.67%) Front End Development
5 2 (16.67%) Modular Programming
5 2 (16.67%) OOP
5 2 (16.67%) Scrum
5 2 (16.67%) SDLC
5 2 (16.67%) Service Delivery
5 2 (16.67%) Statistics
5 2 (16.67%) TDD
5 2 (16.67%) Web Application Development
6 1 (8.33%) Analytics
6 1 (8.33%) SEO
6 1 (8.33%) Software Delivery
Programming Languages
1 12 (100.00%) JavaScript
2 8 (66.67%) C#
2 8 (66.67%) Perl
2 8 (66.67%) Python
3 7 (58.33%) PHP
4 6 (50.00%) Ruby
5 2 (16.67%) Java
5 2 (16.67%) SQL
Qualifications
1 8 (66.67%) Degree
Systems Management
1 1 (8.33%) Ansible
Vendors
1 6 (50.00%) Apple
2 2 (16.67%) Microsoft
2 2 (16.67%) Sitecore
3 1 (8.33%) DoubleClick
3 1 (8.33%) F5
3 1 (8.33%) Google
3 1 (8.33%) Oracle